A molding die with a lip of a PTFE patch oil seal

Abstract

The present invention relates to the field of forming mold technology, and proposes a forming mold with a lip for a PTFE patch oil seal, comprising a middle mold and a lower mold, wherein the middle mold abuts against the lower mold, and the lower mold has a receiving cavity; one end of the first mold core is slidably arranged in the receiving cavity, and the two ends of the skeleton abut against the middle mold and the first mold core respectively; the second mold core is arranged in the first mold core, and a compression space is formed between the second mold core and the middle mold, one side of the lip is located in the compression space, and a forming space is formed between the middle mold, the lower mold, the first mold core and the second mold core, and the other side of the skeleton and the lip is located in the forming space. Through the above technical scheme, the problem of low yield rate during the molding of patch oil seals in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of molding dies, and in particular to a molding die with a lip of a PTFE patch oil seal. Background Art

[0002] Compared with oil seals with pure rubber lips, PTFE oil seals are composed of a skeleton, a rubber body, and a lip made of PTFE sheets; they have better wear resistance, high temperature resistance, and resistance to various media.

[0003] The mold technology usually used to produce this PTFE oil seal product is a three-plate mold flat pressing method or a two-plate mold flat pressing method. When the product is vulcanized, the rubber is first pressed at the upper and lower sealing positions of the mold to make it flow. However, during the pressing process, the uneven force generated will cause the PTFE lip placed in the mold cavity to be squeezed, resulting in problems such as deflection, shaking, and deformation. In addition, the rubber often overflows to the axial direction of the PTFE lip in the mold cavity. The produced oil seal has a poor appearance, the lip is prone to deflection and excess glue, and some lip positions are poorly adhered, resulting in quality defects such as poor sealing and poor functionality, and a high product defective rate. Summary of the invention

[0004] The invention provides a molding die with a lip of a PTFE patch oil seal, which solves the problem of low yield rate during molding of the patch oil seal in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] A forming die with a lip of a PTFE patch oil seal, the oil seal having a frame and a lip, comprising:

[0007] A middle mold and a lower mold, wherein the middle mold abuts against the lower mold, and the lower mold has a receiving cavity;

[0008] A first mold core, one end of which is slidably disposed in the accommodating cavity, and two ends of the skeleton are respectively in contact with the middle mold and the first mold core;

[0009] The second mold core is arranged in the first mold core, a clamping space is formed between the second mold core and the middle mold, one side of the lip is located in the clamping space, a molding space is formed between the middle mold, the lower mold, the first mold core and the second mold core, and the skeleton and the other side of the lip are located in the molding space.

[0010] Optionally, the middle mold has a material cavity, the second mold core has a sub-gate, there are multiple sub-gates, the multiple sub-gates are distributed at intervals, the sub-gate has an inlet and an outlet, the inlet and the outlet are connected to the material cavity and the molding space respectively.

[0011] Optionally, the second mold core has a sub-casting bin, the inlet is connected to the material cavity through the sub-casting bin, and the bottom height of the sub-casting bin is lower than the height of the inlet.

[0012] Optionally, it also includes:

[0013] An insert, one end of which is slidably disposed in the first mold core, and the other end of which is disposed on the second mold core;

[0014] The upper mold is slidably arranged relative to the middle mold, and the upper mold has a pushing block for abutting against the side wall of the material cavity.

[0015] Optionally, the sub-casting bin is in a frustum shape, and a plurality of the sub-casting gates are spaced apart about the circumference of the sub-casting bin, further comprising:

[0016] A material leveling block is arranged in the sub-casting bin, the material leveling block is located directly below the material cavity, and the material leveling block and the sub-casting bin are arranged concentrically.

[0017] Optionally, the middle mold has a limiting groove at one end close to the second mold core, and the second mold core has a protrusion. After the middle mold presses the lower mold, the protrusion abuts against the limiting groove, and the lip is located on the outside of the protrusion.

[0018] Optionally, the first mold core has a support platform, and the support platform is multiple, and the multiple support platforms are distributed at intervals around the circumference, the middle mold has a limiting step, and the support platform and the limiting step are respectively abutted against two ends of the skeleton;

[0019] The second mold core has a limiting ring groove, and there are multiple limiting ring grooves. The multiple limiting ring grooves are concentrically distributed, and the limiting ring groove abuts against the lip piece.

[0020] Optionally, the lower mold has a vent hole, the vent hole has a connecting port and an exhaust port, the connecting port is used to connect to a vacuum device, and the exhaust port abuts against the middle mold.

[0021] Optionally, it also includes:

[0022] A guide tube, wherein the guide tube is slidably arranged relative to the lower mold, and one end of the guide tube passes through the lower mold and the first mold core and is located in the second mold core;

[0023] A limit plate, wherein the limit plate is slidably disposed on the lower mold insert, and the second mold core is located between the limit plate and the material leveling block;

[0024] A fixing member is detachably arranged on the insert, and the fixing member abuts against the limiting plate.

[0025] Optionally, the guide tube has an inner cavity, the inner cavity has a return port and a discharge port, and after the guide tube slides through the second mold core, the return port is connected to the sub-gate, and the return port faces the inlet.

[0026] The working principle and beneficial effects of the present invention are:

[0027] In the present invention, in order to solve the problem of low yield rate during molding of patch oil seals in the related art, the molding mold is set to four parts: a middle mold, a lower mold, a first mold core and a second mold core. The skeleton can be fixed between the middle mold and the first mold core, and the lip can be fixed between the middle mold and the second mold core. The lower mold, the first mold core and the second mold core together constitute the molding mold on the lower side of the oil seal. Since the lip is pressed between the middle mold and the second mold core, the rubber will not enter the lip when flowing, thereby improving the yield rate of the oil seal. After the mold is closed, the skeleton and the lip are fixed. After the preformed rubber enters the molding space from the middle mold, the molding of the oil seal can be completed at one time. During the molding process, one side of the lip is always pressed, and the wrinkles of the lip will not be damaged, further ensuring the appearance and function of the oil seal after molding. After the molding is completed, due to the sliding setting of the first mold core, the oil seal can be directly ejected by sliding the first mold core to separate the oil seal from the lower mold, and the second mold core can be ejected again, which facilitates the separation of the oil seal from the first mold core and the second mold core, avoiding damage to the oil seal during the process of taking out the oil seal, thereby ensuring that the oil seal can maintain a good state during the pouring and demoulding processes, thereby improving the yield rate of oil seal production.

[0028] The working principle of the present invention is that before the oil seal is produced, the first mold core is first loaded into the lower mold, and then the second mold core is loaded into the first mold core. At this time, the lower molding mold of the oil seal is installed. The skeleton is placed on the first mold core, and then the lip is placed on the second mold core. The prefabricated parts of the oil seal are placed, and the middle mold and the lower mold are molded together. At this time, the skeleton is fixed between the middle mold and the first mold core, and the lip is pressed in the compression space between the middle mold and the second mold core. The preparation work before pouring the oil seal is completed. The rubber is poured into the molding space through the middle mold. After the rubber fills the molding space, the rubber, the skeleton and the lip form a complete oil seal. After the oil seal is molded, it is cooled and shaped. When demolding, the middle mold and the lower mold are first separated, and then the first mold core and the second mold core are ejected in sequence, and the oil seal can be completely removed from the molding mold. During the molding process, the frame and the lip are always in a fixed position, and the pouring of the oil seal is completed after one pouring. Since one side of the lip is pressed, no rubber will enter the wrinkle area of ​​the lip during the molding process. During the demolding process, there is only a single vertical separation between the molded oil seal and the molding mold. Therefore, the molding quality of the oil seal is better and the yield rate is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0030] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0031] Figure 2 It is a three-dimensional diagram of the overall structure of the present invention;

[0032] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0033] Figure 4 It is a schematic diagram of the local structure of the present invention;

[0034] Figure 5 It is a schematic diagram of the oil seal structure in the present invention;

[0035] Figure 6 This is a schematic diagram of the first mold core structure of the present invention;

[0036] Figure 7 For the present invention Figure 1 Enlarged structural diagram at B in the middle.

[0037] In the figure: 1, oil seal, 11, skeleton, 12, lip, 2, middle mold, 3, lower mold, 31, accommodating cavity, 4, first mold core, 5, second mold core, 101, pressing space, 102, molding space, 21, material cavity, 51, sub-gate, 511, inlet, 512, outlet, 52, sub-casting bin, 6, insert, 7, upper mold, 71, push block, 61, material leveling block, 22, limiting groove, 53, protrusion, 41, support platform, 23, limiting step, 54, limiting ring groove, 32, vent, 321, connecting port, 322, exhaust port, 8, guide tube, 9, limiting plate, 10, fixing part, 81, inner cavity, 811, return port, 812, discharge port. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0039] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0040] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] Reference Figure 1 to Figure 7 , which is the first embodiment of the present invention, proposes a molding die for a PTFE patch oil seal with a lip, the oil seal 1 having a skeleton 11 and a lip 12, including a middle mold 2 and a lower mold 3, the middle mold 2 abuts against the lower mold 3, and the lower mold 3 has a accommodating cavity 31; one end of the first mold core 4 is slidably arranged in the accommodating cavity 31, and the two ends of the skeleton 11 abut against the middle mold 2 and the first mold core 4 respectively; the second mold core 5 is arranged in the first mold core 4, and a pressing space 101 is formed between the second mold core 5 and the middle mold 2, one side of the lip 12 is located in the pressing space 101, and a molding space 102 is formed between the middle mold 2, the lower mold 3, the first mold core 4 and the second mold core 5, and the other side of the skeleton 11 and the lip 12 is located in the molding space 102.

[0043] In this embodiment, in order to solve the problem of low yield rate during molding of the patch oil seal 1 in the related art, the molding mold is set to four parts: the middle mold 2, the lower mold 3, the first mold core 4 and the second mold core 5. The skeleton 11 can be fixed between the middle mold 2 and the first mold core 4, and the lip 12 can be fixed between the middle mold 2 and the second mold core 5. The lower mold 3, the first mold core 4 and the second mold core 5 together constitute the molding mold on the lower side of the oil seal 1. Since the lip 12 is pressed between the middle mold 2 and the second mold core 5, the rubber will not enter the lip 12 when flowing, thereby improving the yield rate of the oil seal 1. After the mold is closed, the skeleton 11 and the lip 12 are fixed. After the preformed rubber enters the molding space 102 from the middle mold 2, the molding of the oil seal 1 can be completed at one time. During the molding process, one side of the lip 12 is always pressed, and the wrinkles of the lip 12 will not be damaged, further ensuring the appearance and function of the oil seal 1 after molding. After the molding is completed, due to the sliding setting of the first mold core 4, the oil seal 1 can be directly ejected by sliding the first mold core 4, so that the oil seal 1 is separated from the lower mold 3, and the second mold core 5 is ejected again, which facilitates the separation of the oil seal 1 from the first mold core 4 and the second mold core 5, avoiding damage to the oil seal 1 during the process of taking out the oil seal 1, thereby ensuring that the oil seal 1 can maintain a good state during the pouring and demolding processes, thereby improving the yield rate of the oil seal 1 production.

[0044] Specifically, before the oil seal 1 is produced, the first mold core 4 is first loaded into the lower mold 3, and then the second mold core 5 is loaded into the first mold core 4. At this time, the lower molding mold of the oil seal 1 is installed. The skeleton 11 is placed on the first mold core 4, and then the lip 12 is placed on the second mold core 5. The prefabricated part of the oil seal 1 is placed, and the middle mold 2 and the lower mold 3 are molded together. At this time, the skeleton 11 is fixed between the middle mold 2 and the first mold core 4, and the lip 12 is pressed in the pressing space 101 between the middle mold 2 and the second mold core 5. The preparation work before pouring the oil seal 1 is completed. The rubber is poured into the molding space 102 through the middle mold 2. After the rubber fills the molding space 102, the rubber, the skeleton 11 and the lip 12 form a complete oil seal 1. After the oil seal 1 is molded, it is cooled and shaped. When demolding, the middle mold 2 and the lower mold 3 are first separated, and then the first mold core 4 and the second mold core 5 are ejected in sequence, and the oil seal 1 can be completely removed from the molding mold. During the molding process, the frame 11 and the lip 12 are always in a certain position, and the casting of the oil seal 1 is completed after one casting. Since one side of the lip 12 is pressed, no rubber will enter the wrinkle area of ​​the lip 12 during the molding process. During the demolding process, there is only a single vertical separation between the molded oil seal 1 and the molding mold. Therefore, the molding quality of the oil seal 1 is better and the yield rate is higher.

[0045] Furthermore, the middle mold 2 has a material cavity 21, and the second mold core 5 has a sub-gate 51. There are multiple sub-gates 51, and the multiple sub-gates 51 are distributed at intervals. The sub-gate 51 has an inlet 511 and an outlet 512, and the inlet 511 and the outlet 512 are connected to the material cavity 21 and the molding space 102 respectively.

[0046] In this embodiment, during pouring, the rubber material is placed in the material cavity 21, and the second mold core 5 is provided with a plurality of branch gates 51 at intervals. The inlet 511 of the branch gate 51 is connected to the material cavity 21, and the rubber material enters the branch gate 51 through the inlet 511, and then enters the molding space 102 through the outlet 512. The plurality of branch gates 51 are arranged at intervals, and the rubber material can enter the molding space 102 from the plurality of outlets 512 at the same time, and the rubber material enters from the lower side of the molding space 102, and slowly moves upward to fill the entire molding space 102. During the upward movement of the rubber material, the gas in the molding space 102 escapes from the upper side of the molding space 102, and the molding quality of the oil seal 1 is better. In order to further improve the appearance quality of the oil seal 1, the dust lip formed at one end of the molding space 102 near the branch gate 51 can be designed as a redundant dust lip. After demoulding is completed, the redundant dust lip is cut off, and the oil seal 1 finally produced has no gate marks and better quality.

[0047] Furthermore, the second mold core 5 has a sub-casting bin 52 , and the inlet 511 is connected to the material cavity 21 through the sub-casting bin 52 . The bottom height of the sub-casting bin 52 is lower than the height of the inlet 511 .

[0048] In this embodiment, since the bottom height of the sub-pouring bin 52 is lower than the height of the inlet 511, the rubber material will first fill the sub-pouring bin 52 after coming out of the material cavity 21, and will enter the multiple sub-pouring gates 51 at the same time after the rubber material has submerged the inlet 511. By setting the sub-pouring bin 52, it is ensured that the rubber material can enter the multiple sub-pouring gates 51 at the same time, so that the oil seal 1 can be uniformly molded, and the molding quality of the oil seal 1 is improved. The specific number of sub-pouring gates 51 can be adjusted according to the model of the oil seal 1.

[0049] Furthermore, it also includes an insert 6, one end of which is slidably arranged in the first mold core 4, and the other end is arranged on the second mold core 5; the upper mold 7 is slidably arranged relative to the middle mold 2, and the upper mold 7 has a push block 71 for abutting against the side wall of the material cavity 21.

[0050] In this embodiment, the second mold core 5 is provided with an insert 6. When demolding, the first mold core 4 and the second mold core 5 can be separated by ejecting the insert 6, so as to facilitate the adjustment of the position of the second mold core 5. After the material cavity 21 is filled with rubber, the upper mold 7 is placed on the middle mold 2 so that the pusher block 71 is located in the material cavity 21. During the pouring process, the pusher block 71 seals the material cavity 21, which can not only keep the temperature but also prevent other impurities from entering the material cavity 21. The first mold core 4, the second mold core 5 and the insert 6 are designed in a split type, which is not only convenient for demolding, but also more convenient for maintenance.

[0051] Furthermore, the sub-casting bin 52 is in a frustum shape, and a plurality of sub-casting gates 51 are distributed at intervals about the circumference of the sub-casting bin 52 , and further includes: a material leveling block 61 , which is arranged in the sub-casting bin 52 , and is located directly below the material cavity 21 , and the material leveling block 61 and the sub-casting bin 52 are arranged concentrically.

[0052] In this embodiment, a material leveling block 61 is provided inside the sub-casting bin 52, and the material leveling block 61 can reduce the volume of the sub-casting bin 52, and avoid a large amount of rubber material accumulating in the sub-casting bin 52. When the rubber material enters the sub-casting bin 52 from the material cavity 21, it will first flow to the top of the material leveling block 61, and then flow into the sub-casting bin 52 along the surface of the material leveling block 61 after passing through the material leveling block 61. Thereby, the amount of rubber material accumulated in the sub-casting bin 52 after the pouring is completed is reduced.

[0053] Furthermore, the middle mold 2 has a limiting groove 22 at one end close to the second mold core 5 , and the second mold core 5 has a protrusion 53 . After the middle mold 2 presses the lower mold 3 , the protrusion 53 abuts against the limiting groove 22 , and the lip 12 is located on the outside of the protrusion 53 .

[0054] In the present embodiment, after the middle mold 2 and the lower mold 3 are closed, the protrusion 53 of the second mold core 5 abuts against the limiting groove 22 of the middle mold 2, which can play a role of limiting locking. Since the lip 12 is located on the outside of the protrusion 53, it can also prevent the rubber from entering the lip 12 from the sub-casting bin 52 during the pouring process, and always keep the pressing part of the lip 12 clean and tidy, thereby improving the appearance and neatness of the oil seal 1 and the molding quality, reducing the finishing process after molding, and improving the molding efficiency of the oil seal 1.

[0055] Furthermore, the first mold core 4 has a support platform 41, and the support platforms 41 have multiple support platforms 41, which are distributed at intervals around the circumference. The middle mold 2 has a limiting step 23, and the support platform 41 and the limiting step 23 are respectively abutted against two ends of the skeleton 11; the second mold core 5 has a limiting ring groove 54, and the limiting ring groove 54 has multiple limiting ring grooves 54, which are concentrically distributed, and the limiting ring groove 54 abuts against the lip piece 12.

[0056] In this embodiment, the first mold core 4 has a plurality of support platforms 41 distributed at intervals, and the skeleton 11 is fixed between the support platforms 41 and the middle mold 2. During pouring, the rubber material passes through the gaps between adjacent support platforms 41 and fills the entire molding space 102. The oil seal 1 can be cast and molded by pouring once. The limiting step 23 can not only fix the skeleton 11 but also play a positioning role, so that the skeleton 11 is fixed in the correct position during pouring. The second mold core 5 is provided with a limiting ring groove 54 that cooperates with the lip 12. Through the setting of the limiting ring groove 54, the lip 12 can be pressed in the correct position. The lip 12 has wrinkles. After being placed on the second mold core 5, it can cooperate with the limiting ring groove 54, which facilitates the positioning of the lip 12 and improves the molding quality of the oil seal 1.

[0057] Furthermore, the lower mold 3 has a vent hole 32 , and the vent hole 32 has a connecting port 321 and an exhaust port 322 . The connecting port 321 is used to connect to the vacuum equipment, and the exhaust port 322 abuts against the middle mold 2 .

[0058] In this embodiment, in order to prevent the bubbles in the molding space 102 and the rubber from being unable to be discharged during the pouring process, thereby affecting the quality of the oil seal 1, a vent hole 32 is provided on the lower mold 3. After the molds are closed, the exhaust port 322 abuts against the middle mold 2. After the vacuum equipment is connected to the connecting port 321, the bubbles in the molding space 102 and the rubber can be discharged, thereby avoiding molding defects during the pouring process.

[0059] Furthermore, it also includes a guide tube 8, which is slidably arranged relative to the lower mold 3, and one end of the guide tube 8 passes through the lower mold 3 and the first mold core 4 and is located in the second mold core 5; the limit plate 9 is slidably arranged on the insert of the lower mold 3, and the second mold core 5 is located between the limit plate 9 and the material leveling block 61; the fixing part 10 is detachably arranged on the insert 6, and the fixing part 10 is abutted against the limit plate 9.

[0060] In this embodiment, in order to prevent the first mold core 4 and the second mold core 5 from being offset during the process of ejecting the first mold core 4 and the second mold core 5 during demolding, thereby affecting the quality of the oil seal 1, a guide tube 8 is provided for guiding, so that the first mold core 4 and the second mold core 5 can only slide in the vertical direction. In order to facilitate the sliding of the second mold core 5 by ejecting the insert 6, a limit plate 9 is provided on the insert 6, and the limit plate 9 can be fixed by the fixing member 10, so that the limit plate 9 can support the second mold core 5 during the process of ejecting the insert 6.

[0061] Furthermore, the guide tube 8 has an inner cavity 81 , and the inner cavity 81 has a return port 811 and a discharge port 812 . After the guide tube 8 slides through the second mold core 5 , the return port 811 is connected to the sub-gate 51 , and the return port 811 faces the inlet 511 .

[0062] In this embodiment, the guide tube 8 can penetrate the second mold core 5 after sliding, and then enter the sub-casting gate 51 after penetrating the second mold core 5. After the pouring is completed, the excess rubber in the material cavity 21 can enter the return port 811, thereby reducing the rubber remaining in the sub-casting bin 52 and the material cavity 21, and facilitating the cleaning and maintenance of the molding mold.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A molding die for a PTFE patch oil seal with a lip, the oil seal (1) having a frame (11) and a lip (12), characterized in that: include: A middle mold (2) and a lower mold (3), wherein the middle mold (2) abuts against the lower mold (3), and the lower mold (3) has a receiving cavity (31); a first mold core (4), one end of the first mold core (4) being slidably disposed in the accommodating cavity (31), and two ends of the skeleton (11) being respectively in contact with the middle mold (2) and the first mold core (4); a second mold core (5), wherein the second mold core (5) is arranged in the first mold core (4), a pressing space (101) is formed between the second mold core (5) and the middle mold (2), one side of the lip piece (12) is located in the pressing space (101), a molding space (102) is formed between the middle mold (2), the lower mold (3), the first mold core (4) and the second mold core (5), and the other side of the skeleton (11) and the lip piece (12) is located in the molding space (102); The middle mold (2) has a material cavity (21), the second mold core (5) has a sub-gate (51), there are a plurality of sub-gates (51), the plurality of sub-gates (51) are spaced apart, the sub-gates (51) have an inlet (511) and an outlet (512), the inlet (511) and the outlet (512) respectively communicate with the material cavity (21) and the molding space (102); The second mold core (5) has a casting bin (52), the inlet (511) is connected to the material cavity (21) through the casting bin (52), and the bottom height of the casting bin (52) is lower than the height of the inlet (511).

2. A molding die with a lip of a PTFE patch oil seal according to claim 1, characterized in that: Also includes: an insert (6), one end of the insert (6) being slidably disposed in the first mold core (4), and the other end of the insert being disposed on the second mold core (5); An upper die (7), the upper die (7) being slidably arranged relative to the middle die (2), the upper die (7) having a material pushing block (71) for abutting against a side wall of the material cavity (21).

3. A forming die with a lip of a PTFE patch oil seal according to claim 2, characterized in that: The sub-casting bin (52) is in the shape of a cone, and the plurality of sub-casting ports (51) are spaced apart and distributed around the circumference of the sub-casting bin (52), and further comprises: A material leveling block (61), wherein the material leveling block (61) is arranged in the sub-casting bin (52), the material leveling block (61) is located directly below the material cavity (21), and the material leveling block (61) and the sub-casting bin (52) are arranged concentrically.

4. The molding die with a lip of a PTFE patch oil seal according to claim 1, characterized in that: The middle mold (2) has a limiting groove (22) at one end close to the second mold core (5), and the second mold core (5) has a protrusion (53). After the middle mold (2) is pressed against the lower mold (3), the protrusion (53) abuts against the limiting groove (22), and the lip (12) is located on the outside of the protrusion (53).

5. The molding die with a lip of a PTFE patch oil seal according to claim 1, characterized in that: The first mold core (4) has a support platform (41), the support platform (41) has a plurality of support platforms (41), the plurality of support platforms (41) are distributed at intervals around the circumference, the middle mold (2) has a limiting step (23), the support platform (41) and the limiting step (23) are respectively abutted against two ends of the frame (11); The second mold core (5) has a limiting ring groove (54), and there are a plurality of the limiting ring grooves (54). The plurality of limiting ring grooves (54) are concentrically distributed, and the limiting ring grooves (54) abut against the lip piece (12).

6. A molding die with a lip of a PTFE patch oil seal according to claim 1, characterized in that: The lower mold (3) has a vent hole (32), the vent hole (32) has a connection port (321) and an air suction port (322), the connection port (321) is used to connect to a vacuum device, and the air suction port (322) abuts against the middle mold (2).

7. A forming die with a lip of a PTFE patch oil seal according to claim 3, characterized in that: Also includes: A guide tube (8), wherein the guide tube (8) is slidably arranged relative to the lower mold (3), and one end of the guide tube (8) passes through the lower mold (3) and the first mold core (4) and is located inside the second mold core (5); a limit plate (9), the limit plate (9) being slidably disposed on the insert of the lower mold (3), the second mold core (5) being located between the limit plate (9) and the material leveling block (61); A fixing member (10), wherein the fixing member (10) is detachably arranged on the insert (6), and the fixing member (10) abuts against the limiting plate (9).

8. A forming die with a lip of a PTFE patch oil seal according to claim 7, characterized in that: The guide tube (8) has an inner cavity (81), and the inner cavity (81) has a return port (811) and a discharge port (812). After the guide tube (8) slides through the second mold core (5), the return port (811) is connected to the sub-gate (51), and the return port (811) faces the inlet (511).

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