Thermoplastic rubber cap type core mold and metal joint vulcanizing device

Abstract

The utility model provides a thermoplastic rubber cap type core mold and metal joint vulcanizing device which comprises an upper tool mold and a lower tool mold which are matched with each other, the upper tool mold and the lower tool mold are respectively provided with a cavity for the core mold to be installed in, the upper tool mold and the lower tool mold are respectively provided with a heating rod, and the heating rods are connected with the upper tool mold and the lower tool mold. And the metal joint mounted in the cavity can be heated and vulcanized through the heating rod. The cap-shaped thermoplastic rubber can be ensured to be bonded with metal, and the sealing property and the strength of the bonding position can meet the requirements of high temperature and high pressure in the co-curing molding process without leakage and strong tensile force in the demolding process without debonding.

Description

Technical Field

[0001] This utility model belongs to the field of co-curing technology of aircraft composite material panels, and relates to a thermoplastic rubber cap-shaped mandrel and a vulcanization device for metal joints. Background Technology

[0002] In the co-curing process of composite material cap-shaped stringer reinforced wall panels, a mandrel is used to fill the inner cavity of the stringer. The mandrel serves two purposes: firstly, it fills the cavity and acts as a pressure-bearing and transmitting element; secondly, it connects to the high-temperature putty strip to ensure sealing during the overall curing process. However, rubber mandrels typically adhere to the high-temperature putty, causing damage. Therefore, a metal mandrel is needed to replace the original mandrel and fulfill the sealing function with the high-temperature putty strip.

[0003] Bonding metal joints to thermoplastic rubber is challenging. Thermoplastic rubber softens at high temperatures, and the bonded joint must withstand the strong tensile forces during demolding without detaching, and also withstand the high temperatures and pressures during curing without leaking. Traditional vulcanization methods cannot guarantee uniform bond strength and sealing, increasing the risk of core mold leakage. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a compact and stable thermoplastic rubber cap mold and metal joint vulcanization device.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A thermoplastic rubber cap-shaped mandrel and metal joint vulcanization device is characterized in that it further includes a tooling upper mold and a tooling lower mold that cooperate with each other. Both the tooling upper mold and the tooling lower mold have cavities for the mandrel to be inserted into. Both the tooling upper mold and the tooling lower mold are equipped with heating rods, which can heat and vulcanize the metal joint installed in the cavity.

[0007] The core mold is made of thermoplastic rubber with a uniform cross-section. Its end can be connected to a metal connector, which is made of aluminum alloy and is used for pre-vulcanization preparation.

[0008] First, connect the metal connector to the core mold. Then, place the connected metal connector and core mold into the cavity of the lower mold of the tooling. After placement, close the upper mold of the tooling onto the upper surface of the lower mold of the tooling, so that it limits the core mold in the cavity between the upper mold and the lower mold of the tooling. Then, tighten the upper mold and the lower mold of the tooling with screws or bolts, and the core mold connector vulcanization preparation is completed.

[0009] The heating rod is controlled by an external control circuit. After being powered on, the vulcanization temperature and vulcanization time are controlled by the control unit.

[0010] After vulcanization is complete and the mold-closing fixture has cooled, remove the upper mold from the fixture and take out the core mold and connector. At this point, the vulcanization process is complete. This ensures that the cap-shaped thermoplastic rubber and metal are properly bonded, guaranteeing that the bonded area has sufficient sealing and strength to withstand the high temperature and pressure of the co-curing molding process without leakage, and that it will not detach from the strong pulling force during demolding.

[0011] In the above-mentioned thermoplastic rubber cap-shaped core mold and metal joint vulcanization device, the upper surface of the lower mold of the tooling is also provided with a positioning hole, and a positioning pin is connected in the positioning hole. The lower surface of the lower mold of the tooling is also provided with a limiting hole that is aligned with the positioning hole.

[0012] A positioning pin is installed in the positioning hole on the upper surface of the lower die of the tooling, and the positioning pin extends out of the upper surface of the lower die of the tooling. When the upper die of the tooling is closed to the lower die of the tooling, the limiting hole at the lower part of the upper die of the tooling can match the positioning pin. That is to say, after the die is closed, the positioning pin is located in the limiting hole, which plays a limiting role and effectively prevents the upper die of the tooling from shifting after the lower die of the tooling is closed.

[0013] In the above-mentioned thermoplastic rubber cap-shaped core mold and metal joint vulcanization device, bolt connection holes are provided at the four corners of the upper mold and the lower mold, and positioning bolts are screwed into the bolt connection holes.

[0014] After the upper and lower molds of the tooling are closed, the bolt connection holes at the four corners of the upper mold and the bolt connection holes at the four corners of the lower mold are aligned. The upper and lower molds are connected together by connecting positioning bolts in the aligned bolt connection holes.

[0015] In the above-mentioned thermoplastic rubber cap mold and metal joint vulcanization device, there are several heating rods, which are evenly distributed along the length direction of the upper mold and the lower mold of the tooling.

[0016] Multiple heating rods are installed on the upper and lower molds of the tooling, which can evenly and quickly heat the metal joints and core molds inside the tooling.

[0017] In the above-mentioned thermoplastic rubber cap-shaped core mold and metal joint vulcanization device, the heating rod is electrically connected to the external control unit, the heating rod is a threaded single-end heating tube, and the heating rod is screwed onto the upper mold and the lower mold of the tooling.

[0018] The control unit enables the heating rod to heat the upper and lower molds of the tooling, which means heating the tooling after mold closing to provide the necessary temperature for vulcanization.

[0019] The upper mold and lower mold of the tooling are provided with screw holes for the installation of heating rods, and the heating rods can be screwed onto the mold closing tooling.

[0020] In the above-mentioned thermoplastic rubber cap-type mandrel and metal joint vulcanization device, two sets of positioning holes and positioning pins are provided, and are respectively symmetrically arranged on both sides of the cavity.

[0021] Positioning holes are provided on both sides of the lower mold cavity of the tooling, and positioning pins are installed in both positioning holes. When the upper mold and the lower mold of the tooling are closed, the positioning pins on the upper surface of the lower mold can be embedded in the limiting holes on the lower surface of the upper mold, thereby increasing the stability of the mold closing.

[0022] In the above-mentioned thermoplastic rubber cap-shaped core mold and metal joint vulcanization device, both the upper mold and the lower mold of the tooling are screwed with lifting rings.

[0023] The lifting rings are installed on the upper part of the upper mold and on both sides of the lower mold. Before mold assembly, the tooling can be lifted using the lifting rings on the upper and lower molds.

[0024] In the above-mentioned thermoplastic rubber cap-type mandrel and metal joint vulcanization device, the lifting ring is made of Q235 material.

[0025] In the above-mentioned thermoplastic rubber cap-shaped core mold and metal joint vulcanization device, the upper mold and the lower mold are made of Invar steel.

[0026] Compared with existing technologies, this thermoplastic rubber cap-shaped mandrel and metal joint vulcanization device, after the metal joint and mandrel are connected, is placed into the cavity of the lower mold of the tooling. The upper mold of the tooling is then hoisted onto the upper part of the lower mold for assembly. In other words, the connected metal joint and mandrel are placed into the cavity of the lower mold. After placement, the upper mold is closed on the upper surface of the lower mold, thus confining the mandrel within the cavity between the upper and lower molds. The upper and lower molds are then tightened together with screws or bolts, completing the vulcanization preparation for the mandrel joint. The mandrel is then fixed in place by the lower and upper molds and heated for vulcanization. After vulcanization is complete and the molded tooling has cooled, the upper mold is removed, and the mandrel and joint are taken out. This completes the vulcanization process, ensuring complete bonding between the thermoplastic rubber cap and the metal, guaranteeing the sealing and strength of the bonded area to withstand the high temperature and pressure of the co-curing process without leakage, and preventing detachment under strong pulling forces during demolding. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the mold assembly structure of the thermoplastic rubber cap core mold and the metal joint vulcanization device.

[0028] Figure 2 This is a schematic diagram of the tooling lower mold structure of the thermoplastic rubber cap core mold and the metal joint vulcanization device.

[0029] Figure 3 This is a schematic diagram of the connection between the metal connector and the core mold.

[0030] In the diagram, 1. Upper tooling mold; 2. Lower tooling mold; 3. Cavity; 4. Heating rod; 5. Positioning hole; 6. Positioning pin; 7. Bolt connection hole; 8. Positioning bolt; 9. Lifting ring. Detailed Implementation

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, this thermoplastic rubber cap core mold and metal joint vulcanization device also includes a mating upper mold 1 and a mating lower mold 2. Both the upper mold 1 and the lower mold 2 have cavities 3 for the core mold to be inserted into. Heating rods 4 are installed on both the upper mold 1 and the lower mold 2, allowing the metal joint installed in the cavity 3 to be heated and vulcanized. The upper surface of the lower mold 2 also has positioning holes 5, with positioning pins 6 connected inside. The lower surface of the lower mold 2 also has limiting holes aligned with the positioning holes 5. Bolt connection holes 7 are provided at the four corners of both the upper mold 1 and the lower mold 2, with positioning bolts 8 screwed into the bolt connection holes 7. There are multiple heating rods 4, evenly distributed along the length of the upper mold 1 and the lower mold 2. The heating rods 4 are electrically connected to an external control unit. There are two sets of positioning holes 5 and positioning pins 6, which are symmetrically arranged on both sides of the cavity 3. The upper part of the upper mold 1 and the side of the lower mold 2 are screwed with lifting rings 9. The lifting rings 9 are made of Q235 material. The upper mold 1 and the lower mold 2 are made of Invar steel.

[0032] In preparation for vulcanization, the mandrel is connected to the metal connector. The mandrel is made of thermoplastic rubber with a uniform cross-section and its end can be connected to the metal connector, which is made of aluminum alloy.

[0033] Clean the cavity 3 of the upper mold 1 and the lower mold 2 of the tooling, and install two positioning pins 6 on the lower mold 2 of the tooling.

[0034] Install the core mold by placing the connected metal connector and core mold into the cavity 3 of the lower mold 2. After placement, close the upper mold 1 onto the upper surface of the lower mold 2, thus limiting the core mold within the cavity 3 between the upper mold 1 and the lower mold 2. Align the limiting hole at the upper mold 1 with the locating pin 6 at the lower mold 2.

[0035] Then, the upper mold 1 and the lower mold 2 of the tooling are tightened together with screws or bolts, and the vulcanization preparation of the core mold joint is completed.

[0036] After installation, the heating rod 4 is controlled by an external control circuit. Once powered on, the vulcanization temperature and time are controlled by the control unit. During heating, the metal joint is made of aluminum alloy, while the vulcanizing device is made of Invar steel; the former has a much smaller coefficient of thermal expansion than the latter. This difference in thermal expansion provides the necessary pressure for vulcanization. Through heating for a fixed time, the mandrel and metal joint can be vulcanized together.

[0037] After vulcanization is complete and the mold fitting has cooled, remove the upper mold 1 from the mold fitting and take out the core mold and connector. At this point, the vulcanization process is complete. This ensures that the thermoplastic rubber of the cap shape is fully bonded to the metal, and that the sealing and strength of the bonded area can meet the high temperature and high pressure of the co-curing molding process without leakage, and that it will not detach from the strong pulling force during demolding.

[0038] This ensures that the thermoplastic rubber of the cap is fully bonded to the metal, and that the sealing and strength of the bonded area can meet the high temperature and high pressure during the co-curing molding process without leakage, and that the strong pulling force during demolding will not cause it to detach.

[0039] All technical features in this embodiment can be freely combined according to actual needs.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vulcanizing device for a thermoplastic rubber cap-shaped mandrel and a metal joint, characterized in that, It also includes a tooling upper mold and a tooling lower mold that cooperate with each other. Both the tooling upper mold and the tooling lower mold have cavities for inserting the core mold. Both the tooling upper mold and the tooling lower mold are equipped with heating rods, which can heat and vulcanize the metal joint installed in the cavity.

2. The vulcanizing device for a thermoplastic rubber cap mold and a metal joint according to claim 1, characterized in that, The upper surface of the lower die of the tooling is also provided with a positioning hole, and a positioning pin is connected in the positioning hole. The lower surface of the lower die of the tooling is also provided with a limiting hole that is aligned with the positioning hole.

3. The vulcanizing device for a thermoplastic rubber cap-shaped mandrel and a metal joint according to claim 2, characterized in that, Bolt connection holes are provided at the four corners of the upper and lower molds of the tooling, and positioning bolts are screwed into the bolt connection holes.

4. The vulcanizing device for a thermoplastic rubber cap mandrel and a metal joint according to claim 3, characterized in that, The number of heating rods is several, and the multiple heating rods are evenly distributed along the length direction of the upper mold and the lower mold of the tooling.

5. The vulcanizing device for a thermoplastic rubber cap mandrel and a metal joint according to claim 4, characterized in that, The heating rod is electrically connected to the external control unit. The heating rod is a threaded single-end heating tube and is screwed onto the upper mold and lower mold of the tooling.

6. The vulcanizing device for a thermoplastic rubber cap mold and a metal joint according to claim 2, characterized in that, The positioning holes and positioning pins are provided in two sets, and are symmetrically arranged on both sides of the cavity.

7. The vulcanizing device for a thermoplastic rubber cap mold and a metal joint according to claim 1, characterized in that, Both the upper and lower molds of the tooling are screwed with lifting rings.

8. The vulcanizing device for a thermoplastic rubber cap mold and a metal joint according to claim 7, characterized in that, The lifting ring is made of Q235 material.

9. The vulcanizing device for a thermoplastic rubber cap mandrel and a metal joint according to claim 1, characterized in that, The upper and lower molds of the tooling are made of Invar steel.

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