Multi-channel small-caliber rubber conversion joint forming device and multi-channel small-caliber rubber conversion joint forming method

Abstract

The invention relates to the technical field of aviation rubber product forming processing, in particular to a multi-channel small-caliber rubber adapter forming device and method.The device mainly comprises an upper die, a middle die, a lower die, a mold core and a die core, and a multi-channel small-caliber rubber adapter formed through the device and method is good in appearance, accurate in size and good in sealing performance. Meanwhile, the labor intensity of workers is greatly reduced in the production process.

Description

Technical Field

[0001] The invention relates to the technical field of aviation rubber product molding and processing, and in particular to a multi-channel small-caliber rubber conversion joint molding device and method. Background Art

[0002] A multi-channel small-diameter rubber conversion joint (hereinafter referred to as the conversion joint) part is used to connect the air pipeline of a certain system of an aircraft. A single set of pressure regulating products in the system air pipeline is equipped with more than 100 conversion joints. If there are burrs or rubber scraps left in the inner hole of the conversion joint, it will cause the pipeline to be blocked, making the function of the entire set of pressure regulating products unable to be realized. In severe cases, it will cause flight failures or even shutdowns. The annual demand for this series of conversion joints is more than 50,000 pieces, and the following problems exist in the molding process:

[0003] 1. The inner diameter of the conversion joint is only 2mm, while the inner diameter of the commonly used rubber conversion joint is about 10mm. Therefore, the aperture of the conversion joint to be formed is much smaller than the inner diameter of the general rubber conversion joint. At present, the conversion joint needs 3 2mm cores to overlap in order to realize the vulcanization molding of the conversion joint. The mold operation is complicated. During the compression molding process, the rubber will pad the core, which often causes mold bumps and damage.

[0004] 2. Two 0.1mm sealing ribs are raised on the outer circle of each tube wall of the conversion joint, and there is a 60° sharp angle requirement. The size requirements are high precision, and the mold cavity size and shape are difficult to process. It is impossible to use tool processing to form. The cavity size consistency of traditional electrospark forming is poor, which directly affects the sealing effect of the vulcanized conversion joint.

[0005] 3. The material is rubber, and the inner hole is required to be free of burrs. The requirement is much higher than the general appearance inspection standard that allows burrs less than 0.2 mm. In addition, due to the good elasticity and toughness of rubber, the burrs generated at the overlap of the core are not easy to remove, and the labor intensity of workers is high. Summary of the invention

[0006] Technical problem solved by the present invention: The present invention provides a multi-channel small-diameter rubber conversion joint molding device and method. The multi-channel small-diameter rubber conversion joint molded by the device and method of the present invention has good appearance, accurate size, and good sealing performance. At the same time, the labor intensity of workers is greatly reduced during the production process.

[0007] Technical solution of the present invention

[0008] A multi-channel small-caliber rubber conversion joint molding device includes an upper mold, a middle mold, a lower mold, a mold core and a mold core:

[0009] The upper mold comprises an upper mold plate, on which two glue pressing blocks protruding from the upper mold plate are arranged, and the two glue pressing blocks are arranged in parallel;

[0010] The middle mold includes a middle mold plate, and two feeding grooves are arranged on the upper surface of the middle mold plate, and the positions of the feeding grooves correspond to the glue pressing blocks of the upper mold one by one, and the shapes match each other, and a cavity is arranged on the lower surface, and the cavity includes an upper core groove, and multiple L-shaped mold grooves are arranged on both sides of the upper core groove, and a flow channel is arranged around the L-shaped mold groove, and the flow channel is connected with the feeding groove through multiple glue injection ports; sealing rib grooves are arranged at both ends of the L-shaped mold groove, which are used for sealing ribs of molded parts;

[0011] The lower mold includes a lower template, and a mold cavity is arranged on the lower surface of the lower template, wherein the mold cavity includes a lower core groove, the lower core groove corresponds to the upper core groove in position, and a plurality of L-shaped mold grooves are arranged on both sides of the lower core groove, and the number of the L-shaped mold grooves on both sides of the lower core groove is the same as that of the L-shaped mold grooves on both sides of the upper core groove, and the positions correspond one to one; sealing rib grooves are arranged at both ends of the L-shaped mold groove, and the number of the sealing rib grooves at both ends of the L-shaped mold groove on the lower template is the same as that of the sealing rib grooves at both ends of the L-shaped mold groove on the middle template, and the positions correspond one to one; a blind hole is arranged at the corner of the L-shaped mold groove for installing the mold core, and a sealing rib groove is arranged at the lower end of the blind hole;

[0012] The core includes a mandrel, which matches the upper core groove of the middle template and the lower core groove of the lower template. A plurality of L-shaped cores are arranged on both sides of the mandrel. The number of L-shaped cores on both sides of the mandrel is the same as that of the L-shaped grooves of the middle template and the lower template, and the positions correspond one to one.

[0013] The mold core is installed in the blind hole at the corner of the L-shaped mold groove of the lower mold plate, which is used to form one channel of the part; the L-shaped core forms the other two channels of the part.

[0014] Furthermore, demolding grooves are provided on both sides of the upper template; demolding grooves are provided at both ends of the upper core groove to facilitate separation of the core from the middle template; demolding grooves are provided at both ends of the lower core groove to facilitate separation of the core from the lower template; demolding grooves are provided on both sides of the lower template to facilitate separation of the lower template from the middle template.

[0015] Furthermore, three positioning holes are arranged on the middle template; and three positioning holes are arranged on the lower template, which correspond one to one with the positions of the three positioning holes on the middle template.

[0016] Furthermore, small positioning holes are respectively arranged at both ends of the lower core groove for positioning the core and the lower template; small positioning holes are arranged on the mandrel, corresponding one to one with the positions of the small positioning holes at both ends of the lower core groove of the lower template.

[0017] Furthermore, a rubber run-off groove is provided on the outer side of the L-shaped mold groove to discharge excess rubber.

[0018] Furthermore, the mold core is a metal cylindrical structure.

[0019] Furthermore, it also includes a guide post, a guide sleeve and a handle. The guide post is installed in the positioning hole of the lower template, and the guide sleeve is installed in the positioning hole of the middle template. The guide post and the guide sleeve are slidably matched to realize the positioning of the middle template and the lower template. The handle is installed at both ends of the middle template for easy lifting.

[0020] Furthermore, the upper mold, the middle mold, the lower mold, the mold core and the mold core are all made of NAK80 material.

[0021] Furthermore, the sealing rib grooves on the middle die and the lower die are formed by electrospark machining, and a chromium copper electrode is used during the electrospark machining, and the spark gap is 0.01-0.02mm.

[0022] A method for molding a multi-channel small-caliber rubber conversion joint using the molding device comprises the following steps:

[0023] Step 1: Use an extruder to extrude a blank of appropriate width according to the process specifications, and use scissors to cut it to a suitable length for standby use;

[0024] Step 2: The molding device is preheated to the specified temperature, and the preheating temperature is 151℃±2℃;

[0025] Step 3: Install the core into the lower mold; then install the middle mold onto the lower mold; then load the cut blank into the feeding slot of the middle mold; finally install the upper mold onto the middle mold, and put the mold into the vulcanizer for pressurized vulcanization;

[0026] Step 4: After keeping the mold for 40min±1min as specified in the process, remove the mold from the vulcanizer, remove the upper mold, middle mold, and core in turn, and then use the demoulding tool to remove the molded conversion joint;

[0027] Step 5: Use a spherical carving knife to remove the burrs on the inner hole and outer shape of the conversion joint. The burrs generated at the overlap of the core are easy to remove, and the labor intensity of workers is greatly reduced;

[0028] Step 6: Inspect the size and appearance of the conversion joint according to the process requirements: Use an optical fiber with a light source to extend into one of the channels of the part, and observe from the other two channels whether the light source is blocked. If so, it is considered that the burrs on the inner hole of the conversion joint have not been cleaned up, and it is necessary to use a spherical carving knife to remove the burrs on the inner hole of the conversion joint again; if the light source is not blocked, it is considered that the burrs on the inner hole of the conversion joint have been cleaned up, and the other two channels are inspected in the same way.

[0029] Beneficial Effects

[0030] The present invention proposes a multi-channel small-caliber rubber conversion joint molding device and method, which has the following advantages:

[0031] 1. The device of the present invention is simple to operate and convenient to add materials. The number of mold grooves is increased from 2 to 16, thereby improving the vulcanization efficiency.

[0032] 2. The integrated L-shaped core design reduces the formation of burrs on the inner hole by 50%, reduces the probability of damage to the mold core, and reduces the difficulty of operation for workers.

[0033] 3. Improve mold materials and processing methods, overcome the difficulties of EDM, improve electrode materials, adjust the discharge gap, and process multiple cavities simultaneously to ensure the uniform size of the 0.1mm sealing ribs.

[0034] 4. The multi-channel small-diameter rubber conversion joint processed by this achievement has good appearance quality, and the burrs on the inner hole and outer edge parting surface are cleanly removed, which meets the product use requirements and ensures the model delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of a multi-channel small-caliber rubber conversion joint molding device of the present invention;

[0036] Figure 2 This is a top view of the assembly of a multi-channel small-caliber rubber conversion joint molding device of the present invention (excluding the upper mold);

[0037] Among them, 1 is the upper mold, 2 is the middle mold, 3 is the lower mold, 4 is the core, 5 is the mold core, 6 is the guide pin, 7 is the guide sleeve, and 8 is the handle;

[0038] Figure 3 This is a bottom view of the upper die of the present invention;

[0039] Figure 4 for Figure 3 Cross-sectional view along direction BB;

[0040] Figure 5 A three-dimensional view of the upper mold of the present invention;

[0041] Figure 6 This is a bottom view of the mold in the present invention;

[0042] Figure 7 for Figure 6 Cross-sectional view along direction BB;

[0043] Figure 8 It is a three-dimensional view of the model in the present invention;

[0044] Fig. 9 for Figure 6 A magnified view of part A;

[0045] Fig.10 It is a top view of the lower mold of the present invention;

[0046] Fig.11 for Fig.10 Cross-sectional view along direction BB;

[0047] Fig.12 A three-dimensional view of the lower mold of the present invention;

[0048] Fig.13 for Fig.10 A magnified view of part A;

[0049] Fig.14 A top view of the core of the present invention;

[0050] Fig.15 It is a side view of the core of the present invention;

[0051] Fig.16 for Fig.14 A magnified view of part A;

[0052] Fig.17 It is a three-dimensional view of the core of the present invention. DETAILED DESCRIPTION

[0053] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] Participate in the Figure 1-17 The present invention provides a multi-channel small-caliber rubber conversion joint molding device, including an upper mold 1, a middle mold 2, a lower mold 3, a core 4 and a mold core 5:

[0056] The upper mold 1 comprises an upper mold plate, on which two glue pressing blocks protruding from the upper mold plate are arranged, and the two glue pressing blocks are arranged in parallel;

[0057] The middle mold 2 includes a middle mold plate, and two feeding grooves are arranged on the upper surface of the middle mold plate. The positions of the feeding grooves correspond to the rubber blocks of the upper mold one by one, and the shapes match. The strip blank is extruded by an extruder, and the blank of suitable length is cut and put into the feeding groove. When in use, the raised rubber blocks at the upper mold plate 2 and the feeding grooves at the middle mold 2 are positioned through clearance fit. A cavity is arranged on the lower surface of the middle mold plate, and the cavity includes an upper core groove, and a plurality of L-shaped mold grooves are arranged on both sides of the upper core groove. In the present invention, Eight L-shaped mold grooves are respectively arranged on both sides of the upper core groove, and a flow channel is arranged around the L-shaped mold groove, and the flow channel is connected with the feeding trough through multiple injection ports arranged at the bottom of the feeding trough; sealing rib grooves are respectively arranged at both ends of the L-shaped mold groove for sealing ribs of molded parts; when the adapter is vulcanized, the blank is added to the feeding trough, and under the high temperature environment of vulcanization, the blank becomes molten, flows through the injection port to the flow on the middle template, and then flows through the flow channel to the L-shaped mold groove, the sealing rib groove and the upper core groove.

[0058] The feeding trough is connected to each L-shaped mold groove through a 1mm runner, which ensures that the L-shaped mold groove, sealing rib groove and upper core groove are filled with rubber, while minimizing the size of the pouring port on the conversion joint to ensure the appearance of the conversion joint.

[0059] The outer contours of the feeding groove, upper core groove, multiple L-shaped mold grooves and sealing rib grooves on the middle mold 2 all adopt flash-free rubber flow grooves. The flash at the parting surface of the vulcanized rubber conversion joint is small and easy to clean, reducing the difficulty of deburring.

[0060] The lower mold 3 includes a lower mold plate, and a mold cavity is arranged on the lower surface of the lower mold plate, wherein the mold cavity includes a lower mold core groove, and the lower mold core groove corresponds to the upper mold core groove in position, and 8 L-shaped mold grooves are arranged on both sides of the lower mold core groove, and the number of the L-shaped mold grooves on both sides of the lower mold core groove is the same as that of the L-shaped mold grooves on both sides of the upper mold core groove, and the positions correspond one to one; sealing rib grooves are arranged at both ends of the L-shaped mold groove, and the number of the sealing rib grooves at both ends of the L-shaped mold groove on the lower mold plate is the same as that of the sealing rib grooves at both ends of the L-shaped mold groove on the middle mold plate, and the positions correspond one to one; a blind hole is arranged at the corner in the middle of the L-shaped mold groove for installing the mold core 5, and a sealing rib groove is arranged at the lower end of the blind hole;

[0061] The outer contours of the lower core groove, L-shaped groove and sealing rib groove on the lower mold 3 all adopt flash-free rubber flow grooves. The flash at the parting surface of the vulcanized rubber conversion joint is small and easy to clean, reducing the difficulty of deburring.

[0062] The core 4 includes a mandrel, which matches the upper core groove of the middle template 2 and the lower core groove of the lower template. Eight L-shaped cores are respectively arranged on both sides of the mandrel. The number of L-shaped cores on both sides of the mandrel is the same as that of the L-shaped grooves of the middle template and the lower template, and the positions correspond one to one.

[0063] In the past, the core was processed by splitting, and one L-shaped core needed to be overlapped with two straight cores. The core 4 of the present invention is designed as a centipede-shaped L-shaped core, which reduces the difficulty of overlapping core processing, reduces one core overlap, and eliminates the inner hole burrs formed by the core overlap. For a three-way joint (theoretically, there are two burrs in the inner hole), reducing one burr means reducing the formation of burrs in the inner hole of the rubber conversion joint by 50%. In addition, the use of an L-shaped core can prevent the bumps and scratches caused by the split core matching.

[0064] The mold core 5 is installed in the blind hole at the corner of the L-shaped mold groove of the lower mold plate, and is used to form one channel of the part; the parts of the L-shaped core on both sides of the corner are used to form the other two channels of the part.

[0065] The device of the present invention adopts a 16-groove injection molding mold structure, and innovatively adopts an integral processing method to set 16 L-shaped grooves on the middle mold plate and the lower mold plate. The 16 L-shaped cores in the core are distributed on both sides of the core shaft in two rows on the left and right, and are matched one by one with the 16 L-shaped grooves set on the middle mold plate and the lower mold plate, thereby reducing the difficulty and workload of workers in installing a single small core during the vulcanization process, avoiding mold bumps and damages, and reducing the formation of 50% burrs on the inner hole of the multi-channel small-diameter rubber conversion joint, thereby achieving quality improvement and efficiency enhancement of the vulcanization of the multi-channel small-diameter rubber conversion joint.

[0066] In the present invention, demolding grooves are arranged on both sides of the bottom of the upper template; demolding grooves are arranged at both ends of the upper core groove to facilitate separation of the core from the middle template; demolding grooves are arranged at both ends of the lower core groove to facilitate separation of the core from the lower template; demolding grooves are arranged on both sides of the lower template to facilitate separation of the lower template from the middle template.

[0067] In the present invention, three positioning holes are arranged on the middle template; three positioning holes are arranged on the lower template, corresponding one to one with the three positioning holes on the middle template; small positioning holes are arranged at both ends of the lower core groove, used for positioning between the core and the lower template; small positioning holes are arranged on the core shaft, corresponding one to one with the small positioning holes at both ends of the lower core groove of the lower template; the core and the lower mold structure are positioned by positioning pins to avoid bumps and scratches during mold assembly.

[0068] In addition, the device of the present invention also includes a guide post 6, a guide sleeve 7 and a handle 8. The guide post 6 is installed in the positioning hole of the lower mold plate, and the guide sleeve 7 is installed in the positioning hole of the middle mold plate. The guide post 6 and the guide sleeve 7 are slidably matched to realize the positioning of the middle mold plate and the lower mold plate. The handle 8 is installed at both ends of the middle mold plate for easy lifting. Therefore, the middle mold and the lower mold, the core and the lower mold are all positioned by the positioning pins and the guide sleeves;

[0069] In the present invention, a rubber run-off groove is provided on the outer side of the L-shaped mold groove on the lower mold plate to discharge excess rubber.

[0070] In the present invention, the mold core is a metal cylindrical structure, which is matched with the sealing rib groove.

[0071] In the present invention, the upper mold 1, the middle mold 2, the lower mold 3, the core 4 and the mold core 5 are all made of NAK80 material, which is wear-resistant and has high hardness. It is suitable for the vulcanization mold structure of the three-way small-diameter rubber conversion joint. The mold has good deformation resistance and long service life.

[0072] In the present invention, the sealing rib grooves on the middle mold 2 and the lower mold 3 are formed by electrospark machining, and chromium-copper electrodes are used during electrospark machining, and the spark gap is 0.01-0.02mm. When electrospark machining the sealing rib grooves, custom chromium-copper electrodes are used instead of ordinary copper electrodes, and the spark gap is adjusted from the traditional 0.05mm to 0.01-0.02mm, which can effectively ensure the uniformity of the machining dimensions at the sealing rib cavity, and then ensure the sealing effect of the vulcanized sealing rib; the method of multi-cavity one-time electrospark machining can effectively ensure the consistency of the machining dimensions at the sealing rib cavity.

[0073] The present invention also provides a method for molding a multi-channel small-caliber rubber conversion joint using the molding device, comprising the following steps:

[0074] Step 1: Use an extruder to extrude a blank of appropriate width according to the process specifications, and use scissors to cut it to a suitable length for standby use;

[0075] Step 2: The molding device is preheated to the specified temperature, and the preheating temperature is 151℃±2℃;

[0076] Step 3: Load the core 4 into the lower mold; then install the middle mold 2 onto the lower mold 3; then load the cut blank into the feeding groove of the middle mold 2; finally install the upper mold 1 onto the middle mold 3, and put the mold into the vulcanizer for pressurized vulcanization; after the core 4 is assembled with the lower mold 3 and the middle mold 2, the material is added, which can reduce the extrusion and impact of the rubber on the mold core during the vulcanization feeding and pressurization process, and prevent the mold core with a diameter of only 2 mm from deforming.

[0077] Step 4: After keeping the mold for 40min±1min as specified in the process, remove the mold from the vulcanizer, remove the upper mold 1, the middle mold 2, and the core 4 in turn, and then use the demoulding tool to remove the molded conversion joint;

[0078] Step 5: Use a spherical carving knife to remove the burrs on the inner hole and outer shape of the conversion joint. The burrs generated at the overlap of the core 4 are easy to remove, and the labor intensity of the workers is greatly reduced;

[0079] Step 6: Inspect the size and appearance of the conversion joint according to the process requirements: Use an optical fiber with a light source to extend into one of the channels of the part, and observe from the other two channels whether the light source is blocked. If so, it is considered that the burrs on the inner hole of the conversion joint have not been cleaned up, and it is necessary to use a spherical carving knife to remove the burrs on the inner hole of the conversion joint again; if the light source is not blocked, it is considered that the burrs on the inner hole of the conversion joint have been cleaned up, and the other two channels are inspected in the same way.

[0080] Example 1: A certain XXX-108-1 part is a three-way rubber conversion joint with an inner hole size of 2mm. Its vulcanization mold body includes 4 parts: upper mold, middle mold, lower mold and centipede-shaped core. During vulcanization, first assemble the mold core to the lower mold, then match the middle mold with the lower mold and the core; add the blank of appropriate length and width to the feeding cavity, buckle the upper mold and pressurize for vulcanization; after vulcanization, remove the molded conversion joint with the help of a special demoulding tool.

[0081] Example 2: A certain XXX-112 part is a T-type connecting rubber conversion joint with an inner hole size of 2mm. Its vulcanization mold body includes 4 parts: upper mold, middle mold, lower mold and centipede-shaped core. During vulcanization, first assemble the mold core to the lower mold, and then match the middle mold with the lower mold and the core; add the blank of appropriate length and width to the feeding cavity, buckle the upper mold and pressurize for vulcanization; after vulcanization, remove the molded conversion joint with the help of a special demoulding tool.

[0082] Example 3: A certain XXX-112 part is a T-type connecting rubber conversion joint with an inner hole size of 3mm. Its vulcanization mold body includes 4 parts: upper mold, middle mold, lower mold and centipede-shaped core. During vulcanization, first assemble the mold core to the lower mold, and then match the middle mold with the lower mold and the core; add the blank of appropriate length and width to the feeding cavity, buckle the upper mold and pressurize for vulcanization; after vulcanization, remove the molded conversion joint with the help of a special demoulding tool.

[0083] 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 technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A multi-channel small-caliber rubber conversion joint molding device, characterized in that: Including upper mold, middle mold, lower mold, core and mold core: The upper mold comprises an upper mold plate, on which two glue pressing blocks protruding from the upper mold plate are arranged, and the two glue pressing blocks are arranged in parallel; The middle mold includes a middle mold plate, and two feeding grooves are arranged on the upper surface of the middle mold plate, and the positions of the feeding grooves correspond to the glue pressing blocks of the upper mold one by one, and the shapes match each other, and a cavity is arranged on the lower surface, and the cavity includes an upper core groove, and multiple L-shaped mold grooves are arranged on both sides of the upper core groove, and a flow channel is arranged around the L-shaped mold groove, and the flow channel is connected with the feeding groove through multiple glue injection ports; sealing rib grooves are arranged at both ends of the L-shaped mold groove, which are used for sealing ribs of molded parts; The lower mold includes a lower template, and a mold cavity is arranged on the lower surface of the lower template, wherein the mold cavity includes a lower core groove, the lower core groove corresponds to the upper core groove in position, and a plurality of L-shaped mold grooves are arranged on both sides of the lower core groove, and the number of the L-shaped mold grooves on both sides of the lower core groove is the same as that of the L-shaped mold grooves on both sides of the upper core groove, and the positions correspond one to one; sealing rib grooves are arranged at both ends of the L-shaped mold groove, and the number of the sealing rib grooves at both ends of the L-shaped mold groove on the lower template is the same as that of the sealing rib grooves at both ends of the L-shaped mold groove on the middle template, and the positions correspond one to one; a blind hole is arranged at the corner of the L-shaped mold groove for installing the mold core, and a sealing rib groove is arranged at the lower end of the blind hole; The core includes a mandrel, which matches the upper core groove of the middle template and the lower core groove of the lower template. A plurality of L-shaped cores are arranged on both sides of the mandrel. The number of L-shaped cores on both sides of the mandrel is the same as that of the L-shaped grooves of the middle template and the lower template, and the positions correspond one to one. The mold core is installed in the blind hole at the corner of the L-shaped mold groove of the lower mold plate, which is used to form one of the channels of the part; The L-shaped core forms the other two channels of the part.

2. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: Both sides of the upper mold plate are provided with demoulding grooves; both ends of the upper core groove are provided with demoulding grooves to facilitate the separation of the core from the middle mold plate; both ends of the lower core groove are provided with demoulding grooves to facilitate the separation of the core from the lower mold plate; Demolding grooves are set on both sides of the lower template to facilitate the separation of the lower template from the middle template.

3. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: Three positioning holes are arranged on the middle template; and three positioning holes are arranged on the lower template, which correspond to the positions of the three positioning holes on the middle template one by one.

4. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: Small positioning holes are respectively arranged at both ends of the lower core groove for positioning the core and the lower template; small positioning holes are arranged on the mandrel, corresponding to the positions of the small positioning holes at both ends of the lower core groove of the lower template.

5. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: A glue running groove is arranged on the outer side of the L-shaped mold groove on the lower mold plate.

6. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: The mold core is a metal cylindrical structure.

7. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: It also includes a guide post, a guide sleeve and a handle. The guide post is installed in the positioning hole of the lower template, the guide sleeve is installed in the positioning hole of the middle template, the guide post and the guide sleeve are slidably matched to realize the positioning of the middle template and the lower template, and the handle is installed at both ends of the middle template.

8. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: The upper mold, middle mold, lower mold, core and mold core are all made of NAK80 material.

9. The multi-channel small-diameter rubber conversion joint molding device according to claim 1 is characterized in that: The sealing rib grooves on the middle die and the lower die are formed by electrospark machining. Chromium copper electrodes are used during electrospark machining, and the spark gap is 0.01-0.02mm.

10. A method for forming a multi-channel small-diameter rubber conversion joint using a forming device as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Use an extruder to extrude a blank of appropriate width according to the process specifications, and use scissors to cut it to a suitable length for standby use; Step 2: The molding device is preheated to the specified temperature, and the preheating temperature is 151℃±2℃; Step 3: Install the core into the lower mold; then install the middle mold onto the lower mold; then load the cut blank into the feeding slot of the middle mold; finally install the upper mold onto the middle mold, and put the mold into the vulcanizer for pressurized vulcanization; Step 4: After keeping the mold for 40min±1min as specified in the process, remove the mold from the vulcanizer, remove the upper mold, middle mold, and core in turn, and then use the demoulding tool to remove the molded conversion joint; Step 5: Use a spherical carving knife to remove the burrs on the inner hole and outer shape of the conversion joint. The burrs generated at the overlap of the core are easy to remove, and the labor intensity of workers is greatly reduced; Step 6: Inspect the size and appearance of the conversion joint according to the process requirements: Use an optical fiber with a light source to extend into one of the channels of the part, and observe from the other two channels whether the light source is blocked. If so, it is considered that the burrs on the inner hole of the conversion joint have not been cleaned up, and it is necessary to use a spherical carving knife to remove the burrs on the inner hole of the conversion joint again; if the light source is not blocked, it is considered that the burrs on the inner hole of the conversion joint have been cleaned up, and the other two channels are inspected in the same way.

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