High-temperature curing thermosetting resin casting body forming device

Abstract

The utility model relates to the technical field of composite material casting, and discloses a high-temperature curing thermosetting resin casting body forming device which comprises a supporting assembly, a mold assembly and a temperature control assembly. The supporting assembly is used for clamping and supporting the mold assembly. The mold assembly comprises a left heating plate, a right heating plate, a left mold plate, a right mold plate, a bow-shaped clamp, a plug piece and a U-shaped frame, a temperature measuring hole is formed in the top of the left mold plate or the right mold plate, the U-shaped frame is clamped by the left mold plate and the right mold plate through fastening bolts, the left mold plate and the right mold plate are clamped by the left heating plate and the right heating plate on the left side and the right side, and the plug piece is plugged into the left side, the right side and the bottom of the U-shaped frame. The temperature control assembly comprises a thermocouple and a temperature controller which are arranged in the temperature measuring hole. According to the utility model, the structure is simple, no special equipment is needed for curing in the curing process, the curing process at the outlet of the U-shaped frame can be conveniently observed through naked eyes, the curing process is immediately adjusted, bubbles in a casting body are reduced as much as possible, and the quality of the casting body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material casting, in particular to a high-temperature curing thermosetting resin casting body forming device. Background Art

[0002] After curing, thermosetting resins form a three-dimensional network structure, exhibiting excellent overall properties, including good mechanical properties, excellent heat resistance, excellent electrical properties, good chemical resistance, and excellent aging resistance. Common thermosetting resins include unsaturated polyester resins, epoxy resins, phenolic resins, and silicone resins. Thermosetting resins are widely used in industrial and civilian fields, including electronics, electrical engineering, energy, chemicals, machinery, automotive and rail transportation, and construction.

[0003] The performance testing of thermosetting resins and glues formed by thermosetting resins through different formulations requires the preparation of specimens through a casting process for performance tests including tensile strength, tensile elastic modulus, elongation at break, compressive strength, compressive elastic modulus, flexural strength, flexural elastic modulus, and impact strength.

[0004] According to GB / 2567 Test Method for Properties of Resin Castings, the flat plate casting mold utilizes smooth glass or steel plates. A U-shaped mold frame is placed between the mold plates to seal the resin and adhesive. Plugs of varying heights are used between the mold plates to control the thickness of the casting. The prepared resin or formulated, mixed adhesive is poured through the casting port into the mold, which has been coated with a release agent. The mold is then cured at room temperature or at high temperature using a flat plate vulcanizer and air dryer according to the required curing process. After curing, the casting sample is obtained, and subsequent processing produces the test specimen.

[0005] For resin castings that require high-temperature curing, existing methods require pouring the resin or adhesive into the mold before curing it in specialized equipment: a flat-plate vulcanizer or air dryer. Furthermore, even with static or vacuum degassing, resins or adhesives with high viscosity at room temperature may still contain bubbles. When the mold is placed in a flat-plate vulcanizer or air dryer for curing, it is impossible to detect bubbles in the resin or adhesive. Therefore, if bubbles are present in the casting, the test data from the sample cannot accurately represent its performance. Summary of the Invention

[0006] In order to overcome or alleviate one or more of the above technical problems, the purpose of the present invention is to provide a high-temperature curing thermosetting resin casting molding device, which has a simple structure and does not require special equipment (flat vulcanizer or blower dryer) for curing. During the curing process, the curing process is adjusted in real time by the phenomenon observed during the curing process at the outlet of the U-shaped frame by the present invention, so as to minimize bubbles in the casting.

[0007] The utility model provides the following technical solutions:

[0008] A high-temperature curing thermosetting resin casting molding device comprises a support assembly (100), a mold assembly (200) and a temperature control assembly (300); the support assembly (100) is used to clamp and support the mold assembly (200), and comprises a base (103), wherein the base (103) is provided with a first long through hole (101) in the opposite direction, and the bottoms of two horizontal support plates (102) are slidably adjusted in the first through hole (101) by bolts and fixed to clamp and support the mold assembly (200); the mold assembly (200) comprises a left heating plate (201), a right heating plate (202), a left template (203), a right template (204), a bow clamp (20 5), a plug (206) and a U-shaped frame (207), a temperature measuring hole (208) is provided on the top of the left template (203) and / or the right template (204), the left and right templates are clamped to the U-shaped frame (207) by fastening bolts, the left and right heating plates are clamped to the left and right templates on the left and right sides by a plurality of the bow-shaped clamps (205), the plug (206) is plugged to the left and right sides and bottom of the U-shaped frame (207); the temperature control component (300) includes a thermocouple (301) and a temperature controller (302) arranged in the temperature measuring hole (208), the temperature controller (302) is electrically connected to the left and right heating plates, and the thermocouple (301) is electrically connected to the temperature controller (302).

[0009] According to some embodiments, the contact surfaces of the left and right templates with the resin are polished to Ra≤0.4.

[0010] According to some embodiments, the U-shaped frame (207) is made of a flexible material, and its thickness is 0.5 to 1.0 mm thicker than that of the plug (206).

[0011] According to some embodiments, the U-shaped frame (207) is cut out with a notch at a corner to tightly connect two adjacent sides.

[0012] According to some embodiments, the top of the fastening bolt is lower than the left and right template surfaces.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The high-temperature curing thermosetting resin casting molding device provided by the utility model includes a support component, a mold component and a temperature control component. The overall structure is simple. During the curing process, no special equipment (flat integral plate vulcanizer or blast dryer) is required for curing. The curing process at the outlet of the U-shaped frame of the molding device can be easily observed with the naked eye, and the curing process can be adjusted in time to minimize bubbles in the casting and improve the quality of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention provides an overall schematic diagram of a high-temperature curing thermosetting resin casting molding device provided in an embodiment of the present invention.

[0016] Figure 2 A schematic diagram of a support assembly provided in an embodiment of the present utility model.

[0017] Figure 3 A schematic diagram of the clamping state of the mold assembly provided in an embodiment of the present utility model.

[0018] Figure 4 An exploded view of a mold assembly provided in an embodiment of the present invention.

[0019] Figure 5 This is a front view of a mold assembly provided in an embodiment of the present invention.

[0020] Figure 6 A cross-sectional schematic diagram of a U-shaped frame of a mold assembly provided in an embodiment of the present invention, which is clamped by left and right templates and a heating plate.

[0021] In the picture:

[0022] Support assembly 100; first through hole 101; support plate 102; base 103; mold assembly 200; left heating plate 201; right heating plate 202; left template 203; right template 204; bow clamp 205; plug 206; U-shaped frame 207; temperature measurement hole 208; temperature control assembly 300; thermocouple 301; temperature controller 302. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the following embodiments and accompanying drawings. However, it should be understood that the embodiments and accompanying drawings are merely illustrative of the present invention and do not limit the scope of protection of the present invention. All reasonable variations and combinations within the scope of the present invention are intended to fall within the scope of protection of the present invention.

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Example 1

[0026] The high temperature curing thermosetting resin casting molding device provided in this embodiment is as follows Figure 1 As shown, it includes a support assembly 100 , a mold assembly 200 , and a temperature control assembly 300 .

[0027] The structure of the support assembly 100 is shown in FIG. Figure 2 A square base 103 is formed by two pairs of channel steel notches, and a pair of slidable support plates 102 are provided on the base 103.

[0028] A first long through hole 101 is provided on the base. A support plate 102 with an L-shaped cross-section is first placed across the top of the relative channel steel and fixedly connected to the base 103 by bolts passing through the first through hole 101. Another support plate 102 is spaced a certain distance apart and is connected to the base 103 in the opposite direction by bolts.

[0029] like Figure 3-4 The mold assembly 200 includes a left heating plate 201, a right heating plate 202, a left mold plate 203, a right mold plate 204, a bow clamp 205, a plug 206, and a U-shaped frame 207. The tops of the left and right mold plates are provided with temperature measurement holes 208. The left and right mold plates are clamped to the U-shaped frame 207 and the plug 206 by tightening bolts. The left and right heating plates are clamped to the left and right mold plates by a number of bow clamps 205 for heating. Figures 5-6 The plug 206 has a specific thickness and is plugged into the left and right sides and bottom of the U-shaped frame 207 to control the thickness of the resin casting body through the specific thickness.

[0030] The left and right heating plates are made of ceramic heating plates, mica heating plates or cast aluminum heating plates. The cast aluminum heating plates have a smooth surface after processing, are not easily deformed after heating, and have a certain strength. Cast aluminum heating plates are preferred.

[0031] The left and right templates are made of steel plates. The left and right templates form the mold, and the contact surface with the resin needs to be polished to Ra≤0.4;

[0032] The plug 206 is made of steel, and the thickness of the resin casting body is controlled by the thickness of the plug 206;

[0033] The material of the U-shaped frame is:

[0034] Silicone rubber tubes with metal wires inserted inside or silicone rubber strips can be used directly. When using silicone rubber strips, it is necessary to cut out notches at the corners so that the two vertical adjacent edges can be tightly combined to prevent resin or rubber from overflowing due to loose sealing.

[0035] The thickness of the silicone rubber tube or strip needs to be 0.5 to 1.0 mm thicker than the thickness of the plug 206. After the left and right templates are tightened by tightening bolts, the silicone rubber tube or strip deforms to the thickness of the plug 206 under pressure, playing a sealing role.

[0036] The fastening bolts are hexagon socket bolts. After the fastening bolts are installed, the top of the bolts should be lower than the surface of the left and right templates to prevent a large gap from appearing between the contact surfaces of the left and right heating plates and the left and right templates.

[0037] The temperature control assembly 300 includes a thermocouple 301 and a temperature controller 302. The temperature controller 302 is used to set the heating temperature for the connected left and right heating plates. The thermocouple 301 is connected to the temperature controller 302 to collect the real-time temperature of the resin and provide real-time feedback to the temperature controller 302. The temperature controller 302 adjusts the temperature of the heating plates based on the feedback, ensuring that the resin temperature matches the preset heating curve.

[0038] The temperature rise curve during the curing process can be set by the temperature control component 300. During the entire curing process, it can be observed with the naked eye through the casting port, and the process parameters can be adjusted in real time according to the curing characteristics.

[0039] The steps for using the high-temperature curing thermosetting resin casting molding device provided in this embodiment are as follows:

[0040] Step 1: Preparation of resin and glue:

[0041] Add resin, curing agent and other components step by step according to the proposed formula, and prepare the resin or glue to be tested according to the mixing process.

[0042] The prepared resin or glue is allowed to stand at room temperature for degassing or vacuum degassing.

[0043] The curing agent of the resin or glue may be one or more than one. It is necessary to determine the 10-hour half-life temperature of each curing agent and set the lowest 10-hour half-life temperature among the curing agents as t1.

[0044] Step 2: Casting body mold preparation:

[0045] A release agent is applied to the inner surfaces of the left and right templates that contact the resin; plugs 206 of a specific thickness are selected according to the thickness of the required casting and are placed on both sides and the bottom edge of the left and right templates;

[0046] A U-shaped frame 207 is made by using a silicone rubber tube with a metal wire inside or directly using a silicone rubber strip. The U-shaped frame 207 is placed inside the plug 206. The thickness of the silicone rubber tube or silicone rubber strip needs to be 0.5 to 1.0 mm higher than the thickness of the plug 206.

[0047] Install the fastening bolts of the left and right templates. After tightening, the silicone rubber can be clearly observed to have deformed.

[0048] Install the left and right heating plates and use the bow clamp 205 to fix the left and right heating plates and the left and right templates into one;

[0049] Place the mold assembly 200 on the base 103. Fix one end face of the mold assembly 200 to the support plate 102 of the support assembly 100. Press the other end face with another support plate 102. Then, fasten the support plate 102 to the base 103 with fastening bolts.

[0050] Step 3: Connect the Temperature Controller:

[0051] Insert the thermocouple 301 into the temperature measurement hole 208 and connect the power lines of the left and right heating plates to the temperature controller 302;

[0052] Step 4: Resin Casting:

[0053] The resin or glue is slowly poured into the mold through the casting port formed by the U-shaped frame 207;

[0054] Step 5: Curing:

[0055] First, set the mold temperature to 20±10℃ lower than t1 (this temperature is t2). As the temperature rises, the viscosity of the resin or glue, which has a higher viscosity at room temperature, decreases. Bubbles that have not escaped at room temperature begin to escape at temperature t2. When no more bubbles are observed to overflow, let it stand for another 10 minutes and then cure according to the curing process set for the resin or glue.

[0056] Step 6: Demolding:

[0057] After curing is completed, the mold assembly 200 is removed from the support assembly 100, the bow clamp 205 is loosened, the left and right heating plates are removed, the fastening bolts are removed, and the left and right templates are opened to remove the casting sample.

[0058] Example 2

[0059] This embodiment provides another more specific implementation process of the high-temperature curing thermosetting resin casting molding device, and the steps are as follows:

[0060] Step 1: Preparation of glue:

[0061] Add in steps according to the formula: unsaturated polyester resin, curing agent (benzoyl peroxide and tert-butyl perbenzoate), internal release agent, dispersant, diluent, filler and other raw materials, and mix the glue according to the mixing process;

[0062] The viscosity of the glue tested at room temperature is 14.5 Pa.s;

[0063] Let it stand at room temperature to degas for 30 minutes;

[0064] Curing agent: benzoyl peroxide and tert-butyl perbenzoate;

[0065] The 10-hour half-life temperature of benzoyl peroxide is lower than that of tert-butyl perbenzoate. The 10-hour half-life temperature of benzoyl peroxide is 72°C as t1.

[0066] Step 2: Casting body mold preparation:

[0067] Apply release agent to the inner surface of the left and right templates that contact the resin;

[0068] Use 4mm thick plugs 206 and place them on both sides and the bottom edge of the mold;

[0069] The U-shaped frame uses a silicone rubber tube with an inner diameter of 3mm and an outer diameter of 5mm. A 2mm diameter metal wire is passed through the silicone rubber tube and folded into a U shape. The U-shaped frame 207 is placed inside the plug 206.

[0070] Install the fastening bolts of the left and right templates. After tightening, the silicone rubber tube can be clearly observed to be deformed.

[0071] Install the left and right heating plates and use the bow clamp 205 to fix the left and right heating plates and the left and right templates into one;

[0072] Place the mold assembly 200 on the base 103, with the opening of the U-shaped frame 207 serving as the pouring port, facing vertically upward. One end of the mold assembly 200 is secured to the already secured support plate 102 of the support assembly 100. The other end is then pressed against another slidable support plate 102, which is then secured to the base 103 using fastening bolts.

[0073] Step 3: Connect the temperature controller 302:

[0074] Insert the thermocouple 301 into the temperature measurement hole 208 , and connect the power line of the heating plate to the temperature controller 302 .

[0075] Step 4: Resin Casting:

[0076] The glue is slowly poured into the mold through the casting port formed by the U-shaped frame 207.

[0077] Step 5: Curing:

[0078] First, set the mold temperature to 52°C. As the temperature rises, the viscosity of the adhesive, which is relatively high at room temperature, decreases. This can be easily observed through the casting port. After a period of time, tiny bubbles may be observed. When no bubbles are visible, let it stand for another 10 minutes. Adjust the temperature and complete the curing process according to the set curing process of the adhesive.

[0079] Step 6: Demolding:

[0080] After curing is completed, the mold assembly 200 is removed from the support assembly 100, the bow clamp 205 is loosened, the left and right heating plates are removed, the fastening bolts are removed, and the left and right templates are opened to remove the casting sample.

[0081] The above embodiments are merely preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that can be made by persons of ordinary skill in the art without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature curing thermosetting resin casting molding device, characterized in that: It includes a support assembly (100), a mold assembly (200) and a temperature control assembly (300); The support assembly (100) is used to clamp and support the mold assembly (200), and includes a base (103). The base (103) is provided with a first long through hole (101) in opposite directions. The bottoms of two horizontal support plates (102) are slidably adjusted in the first through hole (101) and fixed by bolts to clamp and support the mold assembly (200); The mold assembly (200) comprises a left heating plate (201), a right heating plate (202), a left template (203), a right template (204), a bow-shaped clamp (205), a plug (206) and a U-shaped frame (207); a temperature measuring hole (208) is provided on the top of the left template (203) and / or the right template (204); the left and right templates are clamped to the U-shaped frame (207) by fastening bolts; the left and right heating plates clamp the left and right templates on the left and right sides through a plurality of the bow-shaped clamps (205); and the plug (206) is plugged into the left and right sides and the bottom of the U-shaped frame (207); The temperature control assembly (300) comprises a thermocouple (301) and a temperature controller (302) arranged in the temperature measuring hole (208); the temperature controller (302) is electrically connected to the left and right heating plates; and the thermocouple (301) is electrically connected to the temperature controller (302).

2. The high-temperature curing thermosetting resin casting molding device according to claim 1, characterized in that: The contact surfaces between the left and right templates and the resin are polished to Ra≤0.

4.

3. The high-temperature curing thermosetting resin casting molding device according to claim 1, characterized in that: The U-shaped frame (207) is made of a flexible material and its thickness is 0.5 to 1.0 mm thicker than that of the plug (206).

4. The high-temperature curing thermosetting resin casting molding device according to claim 3, characterized in that: The U-shaped frame (207) has a notch cut out at the corner to tightly connect two adjacent sides.

5. The high-temperature curing thermosetting resin casting molding device according to claim 1, characterized in that: The tops of the fastening bolts are lower than the surfaces of the left and right templates.

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