A vulcanization forming die for a leather cup lip and a processing method thereof

Abstract

The application belongs to the technical field of reinforced skin bowl for aviation, and discloses a kind of skin bowl lip directly vulcanization forming die and processing method, the die includes upper die plate, middle die plate, lower die plate and core, upper die plate, middle die plate and lower die plate are sequentially stacked and installed, longitudinal through hole is opened in the center of lower die plate, and the core is arranged in the through hole;Wherein, the outer edge shape of the reinforced skin bowl is formed between upper die plate, middle die plate and lower die plate, the lower die plate is supported in the recess of the reinforced skin bowl, the lip part of the reinforced skin bowl is formed by die pressing of the core and the lower die plate, and the lip sharp edge part of the reinforced skin bowl is die pressed by the core. The reinforced skin bowl produced according to the above application has smooth skin bowl lip surface, high coaxiality of the lip and the outer circle, and can solve the technical problems of leakage at the dynamic seal between the skin bowl and the shaft and slag dropping at the skin bowl lip caused by rough skin bowl lip surface.

Description

Technical Field

[0001] This invention belongs to the technical field of reinforced leather cups for aviation, and relates to a manufacturing method of reinforced leather cups for aviation, and more particularly to a mold and processing method for direct vulcanization molding of the lip of a leather cup. Background Technology

[0002] In aviation pump systems, reinforced cup assemblies (HB4-94) are generally used for sealing. Figure 1 As shown, this type of reinforced cup assembly consists of a cup with an inner skeleton and a ring spring, and belongs to the category of lip seals. Figure 1 The piston cup assembly shown is typically installed at the end of the pump cover's rotating shaft. During operation, the piston cup assembly and the rotating shaft are fully engaged, forming a dynamic friction pair to achieve a seal on the lubricating oil end. Figure 2 As shown, the interference contact between the flexible rubber sealing lip and the shaft prevents leakage of bearing lubricant and serves as a housing seal.

[0003] 1HB4-94-83 clearly states: 10° chamfering by grinding. Following traditional leather cup manufacturing methods, the process involves vulcanization followed by turning: first... Figure 3 The leather cup mold with the structure shown is used to vulcanize and form the leather cup on a flat vulcanizing machine; then the lip is machined on a conventional machine tool, i.e. Figure 3 On side A, use metallographic sandpaper to gently sand and remove the lip after removing the burrs.

[0004] The soft rubber lip is difficult to control during processing due to material properties, often resulting in issues such as lip misalignment, out-of-tolerance coaxiality with the outer circle, and rough lip surface. This leads to poor consistency in product dimensions and precision, a low product qualification rate, and a long processing cycle. The processed rubber cups exhibit obvious signs resembling mechanical tearing, with coarse particles. Under a magnifying glass, serrated burrs can be seen on the edges of the rubber cups, making them highly susceptible to problems such as leakage in the dynamic seal between the rubber cup and the drive shaft, and chipping of the rubber cup lip. Summary of the Invention

[0005] The purpose of this invention is to propose a direct vulcanization molding die and processing method for leather cup lips, which has low processing difficulty, high production efficiency, stable and reliable quality, and can ensure that the surface of the leather cup lip is smooth and meet the requirements of lip sealing.

[0006] The technical solution of the present invention is as follows:

[0007] A vulcanizing mold for the lip of a leather cup includes an upper mold, a middle mold, a lower mold, and a core. The upper mold, middle mold, and lower mold are stacked and installed in sequence. A longitudinal through hole is opened in the center of the lower mold, and the core is placed in the through hole. The upper mold, middle mold, and lower mold form the outer edge of the reinforced leather cup. The lower mold is supported in the recess of the reinforced leather cup. The lip of the reinforced leather cup is formed by molding the core and the lower mold. The pointed edge of the lip of the reinforced leather cup is molded by the core.

[0008] Furthermore, during the manufacturing of the reinforcing cup, the outer ring of the upper template contacts the middle template, the lower part and bottom of the inner ring of the middle template contacts the lower template, the central hole of the lower template contacts the core, and the top of the core contacts the protruding central cylinder at the bottom of the upper template; the reinforcing cup is located in the cavity formed between the outer ring of the central cylinder at the bottom of the upper template, the upper part of the inner ring of the middle template, the top punch of the lower template, and the top outer ring of the core.

[0009] Furthermore, the top outer ring of the core is provided with a matching model for the lip tip of the reinforcing cup to ensure the chamfering requirements of the lip tip of the reinforcing cup.

[0010] Furthermore, there are vent holes in the center of the core.

[0011] Furthermore, an air vent is provided in the center of the upper template.

[0012] Furthermore, it also includes a push rod with a blind hole at its end. The size and shape of the blind hole at the top of the push rod match the size and shape of the metal frame of the reinforcing cup.

[0013] A method for direct vulcanization molding of leather cup lips, using the aforementioned mold for direct vulcanization molding of leather cup lips, includes the following steps:

[0014] Step 1: Insert the core into the center hole of the lower template;

[0015] Step 2: After wrapping the metal frame of the reinforcing cup with thin rubber, place the pressed film on the metal frame and install the middle template;

[0016] Step 3: Install the template and then perform vulcanization molding.

[0017] Step 4: After the vulcanization molding process is completed, pry open the upper mold, lower mold, and core respectively;

[0018] Step 5: Finally, remove the reinforcing cup on the middle template using the top rod.

[0019] Furthermore, in step four, the mold is cooled down before being opened.

[0020] Furthermore, the middle template with the reinforced cup is placed on the press. The force application mechanism of the press is connected to the push rod, and the reinforced cup is removed from the middle template by impacting the metal frame with the push rod.

[0021] Technical effects of the present invention:

[0022] 1. The reinforced leather cup produced according to the above invention has a smooth lip surface and a high degree of coaxiality between the lip and the outer circle, which can solve the technical problem of leakage at the dynamic seal between the leather cup and the shaft and flaking at the lip of the leather cup caused by the rough surface of the lip of the reinforced leather cup.

[0023] 2. Through extensive engineering practice by the inventors, it has been verified that the leather cup produced by this new structure can withstand long-term grinding tests, thus extending the service life of the sealing components.

[0024] 3. The change in the parting surface position of the leather cup in this invention can remove the sulfurized flash on a conventional lathe, reducing the difficulty of removing flash and burrs, thereby improving the appearance quality of the leather cup. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the reinforced leather cup manufactured according to the present invention;

[0027] Figure 2 This is a schematic diagram illustrating the use of the reinforced leather cup manufactured according to the present invention;

[0028] Figure 3 This is a schematic diagram of a mold for processing reinforced leather bowls using conventional methods in the background art of this invention;

[0029] Figure 4 This is a schematic diagram of the mold structure for direct vulcanization molding of the lip of the present invention;

[0030] Figure 5 This is a schematic diagram of the mold opening device;

[0031] Figure 6 and Figure 7 This is a schematic diagram showing the different parting positions of the outer surface of the lips;

[0032] Figure 8 This is an enlarged view of the parting position on the outer surface of the lip of the mold structure of the present invention;

[0033] Among them, 1—upper template, 2—middle template, 3—lower template, 4—core, 5—reinforcing cup, 6—top rod, 7—shaft, 8—spring, 9—shell. Detailed Implementation

[0034] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are given in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or point connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1:

[0038] A vulcanizing mold for the lip of a leather cup includes an upper mold 1, a middle mold 2, a lower mold 3, and a core 4. The upper mold 1, the middle mold 2, and the lower mold 3 are stacked and installed in sequence. A longitudinal through hole is opened in the center of the lower mold 3, and the core 4 is located in the through hole. The upper mold 1, the middle mold 2, and the lower mold 3 form the outer edge of a reinforced leather cup 5. The lower mold 3 is supported in the recess of the reinforced leather cup 5. The lip of the reinforced leather cup 5 is formed by molding the core 4 and the lower mold 3. The pointed edge of the lip of the reinforced leather cup 5 is all molded by the core 4.

[0039] When manufacturing the reinforced cup 5, the outer ring of the upper template 1 contacts the middle template 2, the lower part and bottom of the inner ring of the middle template 2 contact the lower template 3, the center hole of the lower template 3 contacts the core 4, and the top of the core 4 contacts the protruding central cylinder at the bottom of the upper template 1. The reinforced cup 5 is located in the cavity formed between the outer ring of the bottom central cylinder of the upper template 1, the upper part of the inner ring of the middle template 2, the top punch of the lower template 3, and the top outer ring of the core 4.

[0040] The top outer ring of the core 4 is provided with a matching model for the lip tip of the reinforcing cup 5 to ensure the chamfering requirements of the lip tip of the reinforcing cup 5.

[0041] There is an air vent in the middle of core 4.

[0042] The upper template 1 has an air vent in the center.

[0043] It also includes a top rod 6, with a blind hole at the end of the top rod 6. The size and shape of the blind hole at the top of the top rod 6 match the size and shape of the metal frame of the reinforced leather cup 5.

[0044] A method for direct vulcanization molding of leather cup lips, using the aforementioned mold for direct vulcanization molding of leather cup lips, includes the following steps:

[0045] Step 1: Insert the core 4 into the center hole of the lower template 3;

[0046] Step 2: After wrapping the metal frame of the reinforcing cup 5 with thin rubber, place the pressed film on the metal frame and install the middle template;

[0047] Step 3: Install the template and then perform vulcanization molding.

[0048] Step 4: After the vulcanization molding process is completed, pry open the upper mold, lower mold, and core respectively;

[0049] Step 5: Finally, remove the reinforcing cup on the middle template using the top rod.

[0050] In step four, the mold is cooled down before being opened.

[0051] The middle template with the reinforced cup is placed on the press. The force application mechanism of the press is connected to the push rod. The reinforced cup is removed from the middle template by impacting the metal frame with the push rod.

[0052] Example 2:

[0053] This invention improves the conventional processing method of the leather cup in HB4-94-83 by changing the original vulcanization + turning process to direct vulcanization molding. The biggest improvement in this implementation is the improvement of the mold structure. Compared with the common internal skeleton oil seal mold, direct vulcanization molding of the leather cup lip can improve the surface quality of the leather cup lip and eliminate the subsequent conical turning molding process. The selection of the parting surface position during lip vulcanization molding is not affected by the flash and burr removal method, further improving the appearance quality of the lip.

[0054] A completely new mold was designed and used, specifically including the following parts:

[0055] The choice of the parting line position in direct vulcanization molding of the lip is very important. For example, the choice of parting line position in direct vulcanization molding of the lip... Figure 3 At the indicated position, the appearance of the leather cup is affected by the level of burr removal. (Select) Figure 4 When the parting line is as shown, the core 4 comes out directly along the inclined surface when the mold is opened, the appearance of the leather cup is intact, the edge of the lip is smooth, and the structure is dense.

[0056] Standard reinforced leather cup molds, such as Figure 3 The parting line between the upper and lower molds is on the extension line of the beveled edge of the lip. After vulcanization, the lip is machined to remove excess material, and finally, the lip is polished with metallographic sandpaper. The surface of the lip of the cup machined by turning and grinding will have mechanical tear marks, and serrated burrs can be seen on the edges under a magnifying glass. In order to ensure a smooth surface of the lip of the cup, the parting line between the upper and lower molds is changed to the parting line between the upper mold and the core (lower mold), avoiding the tip of the lip.

[0057] The original vulcanization + turning process was changed to vulcanization molding, which reduces one processing step and eliminates the need for fixtures during machining, turning and grinding. The turning and grinding of the lip of the leather cup requires a high level of skill from the workers. The change in processing method reduces the processing difficulty of the leather cup, lowers production costs, eliminates the metallographic sandpaper grinding and polishing process, and reduces environmental pollution.

[0058] The positioning method between the template, middle template, and lower template is conical positioning. This positioning method makes mold removal easy, can automatically center, and ensures that the mold will not be damaged when the mold is closed. The conical fit is easy to machine on a regular lathe and has little dependence on high-precision mold manufacturing equipment.

[0059] The lip of the leather cup is directly vulcanized, and the coaxiality accuracy between the lip and the outer circle is guaranteed by the mold in one vulcanization process.

[0060] The lower template and the core are fitted with a transition fit to ensure smooth demolding of the core; when reused, there is no obvious gap between the lower template and the core, which will not cause the glue to overflow and form flash or burrs.

[0061] Figure 4The mold structure at the parting line shown can be put into production simply by processing it according to the drawing. Figure 6 and Figure 7 The mold structure at the parting line shown requires continuous adjustment of appropriate parameters based on the force exerted on the lip at the spring groove during mold opening to ensure that the lip does not tear. This requires a significant amount of rework and trial molding time, resulting in a long production cycle.

[0062] By altering the position of the parting line on the leather cup, vulcanized flash can be removed on a conventional lathe. This reduces the difficulty of removing flash and burrs, thereby improving the appearance quality of the leather cup.

[0063] Example 3:

[0064] This invention improves the conventional processing method of the leather cup in HB4-94-83 by changing the original vulcanization + turning process to direct vulcanization molding. The biggest improvement in this process is the improvement of the mold structure. Figure 4 In the mold structure diagram, the reinforced leather cup mold is composed of three layers of templates: upper template, middle template, and lower template, as well as a core. The lower side of the upper template, the inner cavity of the middle template, and the upper side of the lower template and the core are connected by conical surfaces to form the mold cavity.

[0065] Figure 4 The production process of the middle-sized leather cup mold has no special requirements; it can be carried out according to the normal leather cup processing steps. When opening the mold, first pry open the upper template 1, lower template 3, and core 4 respectively, then place the middle template containing the leather cup part onto the press. Figure 5 The diagram shown illustrates the mold opening process of the reinforced leather cup. By pressing out the lip with ejector pin 6, a leather cup with a directly vulcanized lip can be obtained.

[0066] Figure 4 The upper and middle templates, as well as the middle and lower templates, are fitted with conical surfaces to ensure automatic centering during mold closing without damaging the mold surface. This mold structure facilitates mold removal and allows for machining on a conventional lathe.

[0067] Figure 1 The core shown has an exhaust hole in the middle to facilitate the smooth discharge of air from the mold cavity. Alternatively, the exhaust hole can be opened on the upper template.

[0068] During the trial production of the direct vulcanization molding structure at the lip, respectively from the attached Figure 6 Appendix Figure 7 Appendix Figure 8 The shown parting positions demonstrate that all three parting positions can produce qualified leather bowls with smooth lip surfaces. (Attached) Figure 6 Appendix Figure 7 The parting position shown is affected by the angle α of the lip cone surface; the larger the angle, the less likely the lip will be torn. Figure 8The parting position shown is the optimal solution and is used in the mold of this invention.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A mold for direct vulcanization molding of the lip of a leather bowl, characterized in that, It includes an upper template (1), a middle template (2), a lower template (3) and a core (4). The upper template (1), the middle template (2) and the lower template (3) are stacked and installed in sequence. The lower template (3) has a longitudinal through hole in the center, and the core (4) is located in the through hole. The upper template (1), the middle template (2) and the lower template (3) form the outer edge of the reinforcing cup (5). The lower template (3) is supported in the recess of the reinforcing cup (5). The lip of the reinforcing cup (5) is formed by molding the core (4) and the lower template (3). The pointed edge of the lip of the reinforcing cup (5) is molded by the core (4). When manufacturing the reinforced cup (5), the outer ring of the upper template (1) contacts the middle template (2), the lower part and bottom of the inner ring of the middle template (2) contacts the lower template (3), the center hole of the lower template (3) contacts the core (4), and the top of the core (4) contacts the protruding central cylinder at the bottom of the upper template (1); the reinforced cup (5) is located in the cavity formed between the outer ring of the bottom central cylinder of the upper template (1), the upper part of the inner ring of the middle template (2), the top punch of the lower template (3), and the top outer ring of the core (4); The top outer ring of the core (4) is provided with a matching model for the lip tip of the reinforcing cup (5) to ensure the chamfering requirements of the lip tip of the reinforcing cup (5).

2. The direct vulcanization molding die for the lip of a leather bowl according to claim 1, characterized in that, The core (4) has an exhaust hole in the middle.

3. The direct vulcanization molding die for the lip of a leather bowl according to claim 1, characterized in that, The upper template (1) has an air vent in the center.

4. A direct vulcanization molding die for the lip of a leather bowl according to any one of claims 1-3, characterized in that, It also includes a top rod (6), the end of which is provided with a blind hole. The size and shape of the blind hole at the top of the top rod (6) match the size and shape of the metal skeleton of the reinforced leather cup (5).

5. A method for direct vulcanization molding of a leather bowl lip, using a mold for direct vulcanization molding of a leather bowl lip as described in claim 4, characterized in that, Includes the following steps: Step 1: Insert the core (4) into the center hole of the lower template (3); Step 2: After wrapping the metal frame of the reinforced leather cup (5) with thin rubber, place the pressed film on the metal frame and install the middle template; Step 3: Install the template and then perform vulcanization molding. Step 4: After the vulcanization molding process is completed, pry open the upper mold, lower mold, and core respectively; Step 5: Finally, remove the reinforcing cup on the middle template using the top rod.

6. The method for direct vulcanization molding of the lip of a leather bowl according to claim 5, characterized in that, In step four, the mold is cooled down before being opened.

7. The method for direct vulcanization molding of the lip of a leather bowl according to claim 5, characterized in that, In step five, the middle template with the reinforced cup is placed on the press. The force application mechanism of the press is connected to the push rod, and the reinforced cup is removed from the middle template by impacting the metal frame with the push rod.

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