A composite sealing method for gas inflation upset

Abstract

The present application relates to a kind of composite sealing methods for gas inflation upsetting, belong to sealing technical field, solve the poor sealing effect of sealing ring between sealed member and mould in prior art, short service life problem.Composite sealing methods for gas inflation upsetting, the sealing method uses composite sealing ring for gas inflation upsetting, and sealed member is sealed by mould, specific steps are as follows: step 1: the mould is taken out from the sealed member;Step 2: the composite sealing ring is covered in the outer wall of the mould;Step 3: the mould of assembling composite sealing ring is inserted into the sealed member;Step 4: the composite sealing ring is inflated;Step 5: the composite sealing ring is blocked, and the sealing of the sealed member is completed.The present application is set to the good protection effect of inflatable sealing ring, avoid inflatable sealing ring air leakage, improve the sealing effect of composite sealing ring, and improve service life.

Description

Technical Field

[0001] This invention relates to the field of sealing fittings and methods, and in particular to a composite sealing method and control method for gas-filled upsetting. Background Technology

[0002] In the process of pneumatic upsetting, a reliable seal is required between the blank (i.e. the sealed part) and the mold.

[0003] However, existing sealing structures are simplistic and, while achieving a sealing effect, still have some shortcomings. Traditional methods commonly use pneumatic sealing rings, which rely on the interference fit between the outer ring of the sealing ring and the workpiece for sealing. When the workpiece is axially fed, the high friction between the workpiece and the outer ring of the sealing ring often causes excessive wear or even pulls the outer ring of the sealing ring out of the sealing groove. This results in the pneumatic sealing ring lacking external constraint, leading to sealing ring failure. Consequently, its service life is short, affecting the actual production process and increasing the production cycle and cost that requires frequent sealing ring replacements. Summary of the Invention

[0004] Based on the above analysis, this invention aims to provide a composite sealing method for pneumatic upsetting, to solve the problems of poor sealing effect and short service life of the sealing ring between the sealed part and the mold in the prior art.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] A composite sealing method for pneumatic upsetting, wherein the sealing method uses a composite sealing ring for pneumatic upsetting to seal the workpiece through a mold, and the specific steps are as follows:

[0007] Step 1: Remove the mold from the sealed component;

[0008] Step 2: Place the composite sealing ring onto the outer wall of the mold;

[0009] Step 3: Insert the mold with the assembled composite sealing ring into the part to be sealed;

[0010] Step 4: Inflate the composite sealing ring;

[0011] Step 5: Seal the composite sealing ring to complete the sealing of the sealed component.

[0012] Furthermore, in step 1, the outer diameter of the mold is smaller than the inner diameter of the sealed component.

[0013] Further, step 2 includes step 21, which involves fitting the inflatable sealing ring into the sealing groove of the mold.

[0014] Furthermore, step 2 also includes step 22, which involves fitting the silicone ring onto the outer wall of the inflatable sealing ring.

[0015] Furthermore, step 2 also includes step 23, which involves fitting the sealing strip onto the outer wall of the silicone ring.

[0016] Further, step 21 includes step 211, inserting the air inlet into the air inlet hole.

[0017] Furthermore, step 21 also includes step 212, which involves fitting the inflatable part into the sealing groove.

[0018] Furthermore, in step 22, the axial width of the inflatable part is the same as the axial width of the silicone ring.

[0019] Furthermore, in step 22, the inner diameter of the silicone ring is smaller than the outer diameter of the inflatable sealing ring.

[0020] Furthermore, in step 23, the sealing strip is fitted onto the outer wall of the silicone ring from the axial direction of the mold.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0022] (1) In order to effectively seal the part to be sealed and the mold, the present invention first separates the part to be sealed from the mold, puts the composite sealing ring on the part to be sealed, then puts the mold with the composite sealing ring inside the part to be sealed, and then inflates the inflatable sealing ring in the composite sealing ring so that the outermost sealing strip of the composite sealing ring is tightly attached to the inner wall of the part to be sealed, thus completing the seal. The outer wall of the inflatable sealing ring is provided with a silicone ring and a sealing strip, which provides good protection for the inflatable sealing ring, prevents air leakage, and improves the life of the sealing ring; at the same time, the silicone ring and sealing strip can multiply the friction between the inflatable sealing ring and the part to be sealed, thereby improving the sealing effect of the composite sealing ring.

[0023] (2) In this invention, the silicone ring is stretched so that the stretched silicone ring fits onto the outer wall of the inflatable sealing ring from the axial direction of the mold. Since the inner diameter of the silicone ring is slightly smaller than the outer diameter of the inflatable sealing ring, and the inner diameter of the silicone ring is about 97%-99% of the outer diameter of the inflatable sealing ring, the silicone ring can play a certain role in fastening the inflatable sealing ring, increasing the friction between the two and increasing the sealing effect.

[0024] (3) The present invention stretches multiple sealing strips, so that the multiple sealing strips are arranged parallel to each other on the outer wall of the silicone ring in the axial direction of the silicone ring, forming a multi-level sealing structure. This multi-level sealing structure enables effective sealing between the sealed part and the mold. Since there are multiple sealing strips, when individual sealing strips are damaged or fail to fit against the inner wall of the sealed part, the other intact sealing strips can still ensure effective sealing of the sealed part; even if there is an assembly error in the sealing strips that causes slight leakage in individual sealing strips, the multi-level sealing structure can reduce the leakage step by step, that is, the other undamaged sealing strips can still ensure effective sealing.

[0025] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or may be learned by practicing the invention. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0027] Figure 1 This is a schematic diagram of the composite sealing ring used in pneumatic upsetting according to the present invention;

[0028] Figure 2 This is a cross-sectional view of a first embodiment of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 1 ;

[0029] Figure 3 A cross-sectional view of a modified embodiment of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 2 ;

[0030] Figure 4 This is a schematic diagram of the composite sealing ring of the present invention used for pneumatic upsetting before inflation.

[0031] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 6 This is a schematic diagram of the composite sealing ring of the present invention after inflation during the use of pneumatic upsetting.

[0033] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0034] Figure 8 This is a top view of Embodiment 2 of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 1 ;

[0035] Figure 9 This is a top view of Embodiment 2 of the composite sealing ring for pneumatic upsetting according to the present invention. Figure 2 ;

[0036] Figure 10 This is a cross-sectional view of the sealing ring being fed during the process of the composite sealing ring used for pneumatic upsetting according to the present invention.

[0037] Figure 11 This is a cross-sectional view of Embodiment 3 of the composite sealing ring for pneumatic upsetting according to the present invention;

[0038] Figure 12 This is a cross-sectional view of a modified embodiment three of the composite sealing ring for pneumatic upsetting according to the present invention;

[0039] Figure 13 This is a cross-sectional view of Embodiment 4 of the composite sealing ring for pneumatic upsetting according to the present invention;

[0040] Figure 14 This is a cross-sectional view of Embodiment 5 of the composite sealing ring for pneumatic upsetting according to the present invention;

[0041] Figure 15 This is a cross-sectional view of Embodiment Six of the Composite Sealing Ring for Pneumatic Upsetting of the present invention. Figure 1 ;

[0042] Figure 16 This is a cross-sectional view of Embodiment Six of the Composite Sealing Ring for Pneumatic Upsetting of the present invention. Figure 2 ;

[0043] Figure 17 This is a flowchart of the composite sealing method for pneumatic upsetting according to the present invention.

[0044] Figure label:

[0045] 1-Sealing strip; 2-Silicone ring; 21-Outer wall of the ring; 22-Inner wall of the ring; 3-Inflatable sealing ring; 31-Inflatable part; 311-Inflatable ring; 312-Inflatable cavity; 32-Inlet part; 321-Inlet nozzle; 322-Inlet cavity; 4-Sealed part; 5-Mold; 51-Sealing groove; 52-Inlet hole. Detailed Implementation

[0046] The following detailed description of a composite sealing method for pneumatic upsetting is provided in conjunction with specific embodiments. These embodiments are for comparative and illustrative purposes only, and the present invention is not limited to these embodiments.

[0047] Example 1

[0048] One specific embodiment of the present invention discloses a composite sealing method for pneumatic upsetting, wherein the sealing method uses a composite sealing ring for pneumatic upsetting to seal the sealed component 4 through a mold 5, such as... Figure 17 As shown, the specific steps are as follows:

[0049] The aforementioned composite sealing rings used for pneumatic upsetting, such as Figures 1-2 As shown, it includes a sealing strip 1, a silicone ring 2, and an inflatable sealing ring 3. The silicone ring 2 is fitted onto the outer wall of the inflatable sealing ring 3, and multiple sealing strips 1 are fitted onto the outer wall of the silicone ring 2. The three are in close contact with each other to form a composite sealing ring structure for inflatable upsetting.

[0050] like Figure 3 As shown, the inflatable sealing ring 3 includes an inflation part 31 and an air inlet part 32. The inflation part 31 is a hollow annular structure with a hollow rectangular cross-section. There is only one air inlet part 32, which is used for gas filling. The air inlet part 32 is a hollow cylindrical structure and is vertically arranged on the inner wall of the inflation part 31.

[0051] The inflation part 31 includes an inflation ring 311 and an inflation cavity 312, with the hollow space inside the inflation ring 311 forming the inflation cavity 312.

[0052] In addition, the air inlet 32 ​​includes an air inlet nozzle 321 and an air inlet cavity 322. The hollow space inside the air inlet nozzle 321 forms the air inlet cavity 322. The inflation cavity 312 is connected to the air inlet cavity 322 to form an integral cavity for filling the inflation sealing ring 3 with gas during inflation upsetting.

[0053] Step 1: Remove the mold 5 from the sealed part 4.

[0054] Both the sealed component 4 and the mold 5 are cylindrical, and the diameter of the mold 5 is smaller than that of the sealed component 4, so that the mold 5 can fit into the sealed component 4.

[0055] Step 2: As Figures 4-5 As shown, the composite sealing ring is fitted onto the outer wall of mold 5.

[0056] Step 21: Insert the inflatable sealing ring 3 into the sealing groove 51 of the mold 5.

[0057] Step 211: Insert the air inlet 32 ​​into the air inlet hole 52;

[0058] First, insert the air inlet 32 ​​of the inflatable sealing ring 3 into the air inlet hole 52 of the mold 5, so that the air inlet 32 ​​is exposed on the outer side of the inner wall of the mold 5.

[0059] Step 212: Fit the inflatable part 31 into the sealing groove 51;

[0060] The air inlet 32 ​​is used to position the air sealing ring 3 on the mold 5. Then, with the air inlet hole 52 as the reference, the entire air inlet 31 is stretched and the entire air inlet 31 is fitted into the sealing groove 51 of the mold 5.

[0061] Since the axial width of the inflatable part 31 of the inflatable sealing ring 3 is the same as the axial width of the sealing groove 51 of the mold 5, it ensures that the inflatable sealing ring 3 can be precisely inserted into the sealing groove 51 of the mold 5, thus preventing the inflatable sealing ring 3 from shifting during the later inflation process.

[0062] Step 22: Place the silicone ring 2 onto the outer wall of the inflatable sealing ring 3.

[0063] The silicone ring 2 is stretched so that the stretched silicone ring 2 fits onto the outer wall of the inflatable sealing ring 3 from the axial direction of the mold 5.

[0064] Since the axial width of the inflatable part 31 of the inflatable sealing ring 3 is the same as the axial width of the silicone ring 2, the silicone ring 2 fits perfectly on the outer wall of the inflatable sealing ring 3, so that the silicone ring 2 and the inflatable sealing ring 3 are on the same axial plane.

[0065] At this moment, the silicone ring 2 is also stuck in the sealing groove 51 of the mold 5.

[0066] Since the inner diameter of the silicone ring 2 is slightly smaller than the outer diameter of the inflatable sealing ring 3, and the inner diameter of the silicone ring 2 is about 97%-99% of the outer diameter of the inflatable sealing ring 3, the silicone ring 2 can play a certain role in tightening the inflatable sealing ring 3, increasing the friction between the two and improving the sealing effect.

[0067] Step 23: Place the sealing strip 1 over the outer wall of the silicone ring 2.

[0068] Stretch the sealing strip 1 so that one sealing strip 1 is fitted onto the outer wall of the silicone ring 2 from the axial direction of the mold 5.

[0069] Next, multiple sealing strips 1 are stretched so that they are arranged parallel to each other on the outer wall of the silicone ring 2 in the axial direction, so that the outer layer of the composite sealing ring (i.e., the multiple sealing strips 1 of the silicone ring 2) forms a multi-level sealing structure.

[0070] This multi-stage sealing structure enables effective sealing between the sealed component 4 and the mold 5. Since there are multiple sealing strips 1, even if one sealing strip 1 is damaged or fails to adhere to the inner wall of the sealed component, the other intact sealing strips 1 can still ensure effective sealing of the sealed component 4. Even if there is an assembly error in the sealing strip 1 that causes slight leakage in one of the sealing strips 1, the multi-stage sealing structure can reduce the leakage step by step, meaning that the other undamaged sealing strips 1 can still ensure effective sealing.

[0071] Because the diameter of sealing strip 1 is smaller than the inner diameter of inflatable sealing ring 3, and the diameter of sealing strip 1 is 70%-80% of the inner diameter of inflatable sealing ring 3, sealing strip 1 can be fixed to the outer wall of silicone ring 2 by friction and elasticity, preventing it from falling off.

[0072] Step 3: After completing the installation of the composite sealing ring in Step 2, insert the mold 5 with the assembled composite sealing ring into the sealed part 4.

[0073] At this time, the gap between the outer wall of the sealing strip 1 and the sealed part 4 is 0.5mm to 3mm. Preferably, the gap between the sealing strip 1 and the sealed part 4 is 2mm, so that the mold 5 with the composite sealing ring assembled can be smoothly inserted into the sealed part 4 without damaging the overall structure of the composite sealing ring.

[0074] Step 4: As Figures 6-7 As shown, the composite sealing ring is inflated.

[0075] When the inflation head is inserted into the air inlet 321 of the air inlet 32, gas or gas flows from the air inlet 322 of the air inlet 32 ​​into the inflation chamber 312 of the inflation part 31, causing the inflation ring 311 of the inflation part 31 to expand. As a result, the silicone ring 2 and the sealing strip 1 on the outer wall of the inflation sealing ring 3 expand with the expansion of the inflation sealing ring 3, and finally the sealing strip 1 fits against the inner wall of the sealing element 4, achieving a sealing effect on the sealed element 4.

[0076] Step 5: Plug the air inlet 321 with a stopper to keep the gas inside the inflation sealing ring 3 constant, thus completing the sealing of the sealed part 4.

[0077] Example 2

[0078] A composite sealing ring for pneumatic upsetting, used in the composite sealing method of Example 1.

[0079] Among them, such as Figure 2 As shown, the sealing strip 1, silicone ring 2, and inflatable sealing ring 3 are all closed circular rings. Specifically, the sealing strip 1 and silicone ring 2 are both solid circular ring structures, with the cross-section of the sealing strip 1 being circular and the cross-section of the silicone ring 2 being rectangular or rectangular.

[0080] Multiple sealing strips 1 are arranged in parallel along the axial direction of the silicone ring 2 and fitted onto the outer wall of the silicone ring 2.

[0081] Specifically, the surface of the silicone ring 2 that is in contact with the sealing strip 1 is the outer wall 21 of the silicone ring, and the surface of the silicone ring 2 that is in contact with the inflatable sealing ring 3 is the inner wall 22 of the silicone ring.

[0082] like Figure 3As shown, the inflatable sealing ring 3 includes an inflation part 31 and an air inlet part 32. The inflation part 31 is a hollow annular structure with a hollow rectangular cross-section. There is only one air inlet part 32, which is used for gas filling. The air inlet part 32 is a hollow cylindrical structure and is vertically arranged on the inner wall of the inflation part 31.

[0083] The inflation part 31 includes an inflation ring 311 and an inflation cavity 312, with the hollow space inside the inflation ring 311 forming the inflation cavity 312.

[0084] In addition, the air inlet 32 ​​includes an air inlet nozzle 321 and an air inlet cavity 322. The hollow space inside the air inlet nozzle 321 forms the air inlet cavity 322. The inflation cavity 312 is connected to the air inlet cavity 322 to form an integral cavity for filling the inflation sealing ring 3 with gas during inflation upsetting.

[0085] like Figure 2 As shown, mold 5 is a mandrel, and mold 5 includes a sealing groove 51 and an air inlet hole 52. The sealing groove 51 and the air inlet hole 52 are arranged in pairs. The sealing groove 51 is circumferentially disposed on the outer wall of mold 5, and the air inlet hole 52 is vertically disposed on the inner side wall of the sealing groove 51. The sealing groove 51 is used to accommodate the inflation ring 311, and the air inlet hole 52 is used to accommodate the air inlet nozzle 321.

[0086] The sealing strip 1, silicone ring 2, and inflatable sealing ring 3 are all made of highly elastic and tough thermosetting materials. Specifically, the inflatable sealing ring 3 is made of silicone, and the sealing strip 1 is made of rubber.

[0087] Compared with the prior art, in addition to the inflatable sealing ring 3, the composite sealing ring of this embodiment also has a silicone ring 2 and a sealing strip 1 on the outer wall of the inflatable sealing ring 3, which play a good protective role for the inflatable sealing ring 3 and prevent the inflatable sealing ring from leaking air. At the same time, the silicone ring 2 and the sealing strip 1 can multiply the friction between the inflatable sealing ring 3 and the sealed part 4, and improve the sealing effect of the composite sealing ring.

[0088] In actual production, the inflatable sealing ring 3, which is in direct contact with air pressure, is most prone to failure. The silicone ring 2 tightly wraps around the inflatable sealing ring 3, thus protecting it. Similarly, the sealing strip 1 also protects the silicone ring 2.

[0089] Multiple sealing strips 1 are arranged in parallel along the axial direction of the silicone ring 2 and fitted onto the outer wall of the silicone ring 2.

[0090] Specifically, the surface of the silicone ring 2 that is in contact with the sealing strip 1 is the outer wall 21 of the silicone ring, and the surface of the silicone ring 2 that is in contact with the inflatable sealing ring 3 is the inner wall 22 of the silicone ring.

[0091] Among them, the length of multiple sealing strips 1 arranged side by side is not greater than the width of the outer wall 21 of the silicone ring 2, so that the sealing strips 1 can be tightly attached to the outer wall 21 of the silicone ring 2 after the inflated sealing ring 3 expands, so that each sealing strip 1 has a fastening effect and a friction effect on the silicone ring 2.

[0092] Furthermore, the axial width of the inflatable part 31 of the inflatable sealing ring 3, the axial width of the silicone ring 2, and the axial width of the sealing groove 51 of the mold 5 are the same. This is to ensure that the composite sealing ring can fit tightly and prevent displacement.

[0093] Furthermore, the diameter of the sealing strip 1 is 0.05 to 0.2 times the axial width of the outer wall 21 of the rubber ring, so that the outer wall 21 of the rubber ring can accommodate 5 to 20 sealing strips 1 arranged side by side, so that the composite sealing ring has enough sealing strips 1 to play an effective sealing role.

[0094] Furthermore, the radial width of the silicone ring 2 is 0.1 to 1 times the axial width of the silicone ring 2.

[0095] Furthermore, the outer wall 21, inner wall 22, and outer wall cross-section of the silicone ring 2 and the inflatable ring 311 are all straight, which allows the silicone ring 2 to fit well with the inflatable sealing ring 3, while the sealing strip 1 can be evenly disposed on the outer wall 21 of the silicone ring.

[0096] like Figures 8-9 As shown, when multiple sealing strips 1 are arranged side by side and tightly, the a ring and b ring of sealing strip 1 will fold or overlap during the sealing process due to the excessive tightness between the sealing strips 1. The sealing strip 1 that is folded on top cannot fit with the silicone ring 2, resulting in a slight air leakage at the fold.

[0097] Even so, the c-ring of the next sealing strip 1 still provides a seal if it does not fold. Even with multiple folds in sealing strip 1, which gradually reduces leakage in the multi-stage sealing structure, the composite sealing ring still provides a considerable sealing effect and meets the material replenishment requirements.

[0098] Preferred, such as Figure 10 As shown, during the pneumatic upsetting process of the composite sealing ring, when multiple sealing strips 1 are evenly distributed on the outer wall 21 of the silicone ring 2, and the distance L1 between the feed end of the outer wall 21 of the ring and the nearest sealing strip 1 is greater than or equal to the amount of material added, the sealing strip 1 can contact the inner wall of the sealed component 4, allowing the sealing strip 1 to roll and rub on the silicone ring 2 without the aforementioned folding between the sealing strips 1, and the silicone ring 2 does not contact the sealed component 4. This is the most ideal sealing state in this embodiment.

[0099] In other words, during the inflation and upsetting process of the composite sealing ring, after the inflation chamber 312 is inflated, the inflation sealing ring 3 expands and undergoes axial upsetting. The friction between the inner wall of the sealed part 4 and the sealing strip 1 is transformed into rotational friction between the sealing strip 1 and the inner wall of the sealed part 4, which greatly reduces the friction force on the sealing strip 1, which is beneficial to the axial feeding of the sealed part 4 and prevents the composite sealing ring from being pulled out of the sealing groove 51.

[0100] Example 3

[0101] like Figure 11 As shown, in Example 3, based on Example 2, the outer wall 21 of the silicone ring 2, the inner wall 22 of the silicone ring 2, and the outer wall of the inflatable ring 311 are all changed to convex shape.

[0102] This structure increases the contact area between the silicone ring 2 and the inflatable sealing ring 3, thereby increasing the friction between them. The outer wall 21 of the silicone ring 2 is convex, allowing the sealing strip 1 to avoid the convex part of the outer wall 21 and be positioned at both ends of the outer wall 21. This allows part of the outer wall 21 of the silicone ring 2 to directly contact the inner wall of the sealed component 4, achieving friction. The sealing strips 1 on both sides also achieve rolling friction with the inner wall of the sealed component 4.

[0103] Therefore, the composite sealing ring can combine rolling friction and contact friction to enhance the sealing effect. Furthermore, even if adjacent sealing strips overlap, it can actually improve the sealing effect.

[0104] Or, such as Figure 12 As shown, the variation of Example 3 is based on Example 1, except that the outer wall 21 of the silicone ring 2 is changed to a convex shape.

[0105] Example 4

[0106] like Figure 13 As shown, in Example 4, based on Example 2, the outer wall 21 of the silicone ring 2 is changed to a concave shape.

[0107] The outer wall 21 of the silicone ring 2 is concave, which allows the sealing strip 1 to be confined in the concave part of the outer wall 21 of the silicone ring, preventing the sealing strip 1 from falling off the silicone ring 2 when replenishing material.

[0108] At this time, the two ends of the outer wall 21 of the silicone ring 2 are in direct contact with the inner wall of the sealed part 4, achieving sealing and contact friction, while the middle sealing strip 1 achieves rolling friction with the inner wall of the sealed part 4.

[0109] Therefore, the composite sealing ring can combine rolling friction and contact friction to enhance the sealing effect. Furthermore, even if adjacent sealing strips overlap, it can actually improve the sealing effect.

[0110] Example 5

[0111] like Figure 14 As shown, in Example 5, based on Example 2, the air ring 311 of the air sealing ring 3 is changed to a concave shape.

[0112] This design allows for a greater degree of expansion of the inflatable sealing ring 3, improving the sealing effect. Furthermore, after expansion, the inflatable sealing ring 3 becomes convex, as shown in Example 2, causing the sealing strip 1 to gather on both sides of the silicone ring, achieving the effect described in Example 2.

[0113] Furthermore, this embodiment can further improve the sealing effect by changing the degree of bulging of the inflatable sealing ring after expansion and increasing the thickness of the silicone ring 2.

[0114] Example 6

[0115] like Figures 15-16 As shown, in Embodiment 6, based on Embodiment 2, the air inlet 32 ​​of the inflatable sealing ring 3 is vertically disposed on the side wall of the inflatable part 31, with the openings facing two different directions of the side walls. This arrangement requires that the air inlet holes 52 of the mold 5 be disposed at both ends of the mold, so that they correspond to the positions of the air inlet 32, making the inflation method more flexible, and inflation can be performed from the side of the mold 5, avoiding the need to insert the inlet into the mold 5 for inflation.

[0116] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite sealing method for pneumatic upsetting, characterized in that, This sealing method uses a composite sealing ring for pneumatic upsetting to seal the part (4) through a mold (5). The specific steps are as follows: Step 1: Remove the mold (5) from the sealed component (4); Step 2: Place the composite sealing ring onto the outer wall of the mold (5); Step 3: Insert the mold (5) with the composite sealing ring assembled into the sealed component (4); Step 4: Inflate the composite sealing ring; Step 5: Seal the composite sealing ring to complete the sealing of the sealed component (4); The composite sealing ring includes an inflatable sealing ring (3), a silicone ring (2), and sealing strips (1). The silicone ring (2) is sleeved on the outer wall of the inflatable sealing ring (3). Multiple sealing strips (1) are arranged parallel to each other along the axial direction of the silicone ring (2) on the outer wall of the silicone ring (2), so that the outer layer of the composite sealing ring forms a multi-level sealing structure. When individual sealing strips (1) are damaged or fail to adhere to the inner wall of the sealed component (4), the other intact sealing strips (1) can still ensure the sealing of the component. Effective sealing of the sealed component (4); both the sealing strip (1) and the silicone ring (2) are solid circular structures, wherein the cross-section of the sealing strip (1) is circular and the cross-section of the silicone ring (2) is rectangular or rectangular; the distance L1 between the feed end of the outer wall (21) of the silicone ring (2) and the nearest sealing strip (1) is greater than or equal to the amount of feed, so that the sealing strip (1) contacts the inner wall of the sealed component (4), so that the sealing strip (1) can roll and rub on the silicone ring (2); Step 2 includes: Step 21: Insert the inflatable sealing ring (3) into the sealing groove (51) of the mold (5); Step 22: Place the silicone ring (2) over the outer wall of the inflatable sealing ring (3); Step 23: Place the sealing strip (1) over the outer wall of the silicone ring (2).

2. The composite sealing method for pneumatic upsetting according to claim 1, characterized in that, In step 1, the outer diameter of the mold (5) is smaller than the inner diameter of the sealed component (4).

3. The composite sealing method for pneumatic upsetting according to claim 1, characterized in that, Step 21 includes step 211, inserting the air inlet (32) into the air inlet hole (52).

4. The composite sealing method for pneumatic upsetting according to claim 3, characterized in that, Step 21 also includes step 212, which involves fitting the inflation part (31) into the sealing groove (51).

5. The composite sealing method for pneumatic upsetting according to claim 4, characterized in that, In step 22, the axial width of the inflation part (31) is the same as the axial width of the silicone ring (2).

6. The composite sealing method for pneumatic upsetting according to claim 4, characterized in that, In step 22, the inner diameter of the silicone ring (2) is smaller than the outer diameter of the inflatable sealing ring (3).

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