A BMC&SMC thermosetting compression molding electrical mold and processing method

Abstract

The invention discloses a BMC&SMC thermosetting compression molding electrical mold and a processing method. The mold comprises an upper mold plate, a lower mold plate, an upper mold core, a lower mold core, a detachable upper mold insert, a slider mechanism, a delayed square guide column, an opening, an overflow trough, a feeding cavity, an electric heating hole, no extrusion screw, no flow channel, and feeding in a weight-based manner, so that the material amount can be more accurately controlled, waste can be reduced, the cost can be reduced, the flash can be reduced, the workload of de-burring can be reduced, exhaust and molding can be facilitated, the pressure and resistance on the molding surface can be dispersed, the mold and the material can be evenly heated, multi-point temperature detection can be performed, the temperature can be displayed in real time, deformation, cracks and size exceeding errors of the product can be prevented, the flash generated is particularly thin and easy to handle, and the product size can be precisely controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of molds, and in particular relates to a design and use technology of a mold. Background Art

[0002] In the electrical industry, thermosetting mold products are basically divided into three categories: shafts, bases, and others. Traditional compression molding uses two materials: DMC and SMC. DMC is bulk molding compound, and SMC is sheet molding compound. SMC has longer glass fiber than DMC. After the product is molded, the flash is thicker, which is time-consuming and labor-intensive to handle. It cannot be removed mechanically, which is not conducive to improving production efficiency.

[0003] BMC&SMC is a semi-dry molding intermediate material for manufacturing glass fiber reinforced thermosetting products. Due to the uniqueness of BMC&SMC thermosetting materials, the material is a bulk molding compound, which is pre-mixed into a paste by unsaturated polyester resin, low shrinkage or low profile additives, initiators, internal mold release agents, mineral fillers, etc., and then thickeners, colorants and other glass fibers of different lengths are added and stirred in a special material kettle. It cannot be directly injection molded like a traditional injection molding machine.

[0004] The difference between BMC&SMC thermosetting compression molds, transfer molds and injection molds is mainly reflected in the pouring system. The space front mold for installing the moving contact and spring at each pole of BMC&SMC thermosetting mold products needs to remove a set of inserts, and the front and rear molds are inserted into the mold. The moving contact passes through the shaft circular hole and the slider is removed for core pulling. Since the material is glass fiber solid, the flash is generated horizontally. During molding, the resin and filler will block the gap between the workpieces. The exhaust groove, insert groove, slider groove, etc. should be easy to clean. For places that cannot be cleaned, the parting surface structure and the flash brought out by the cold material groove should be considered in the design. It is difficult to disassemble and assemble after long-term use and cooling. In addition, the thermal expansion of the metal and the product precision requirements require that the matching gap between the workpieces should be fully considered during processing. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention proposes a BMC&SMC thermosetting compression molding electrical mold and a processing method. In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0006] The mold includes: an upper mold plate, a lower mold plate, an upper mold core, a lower mold core, a detachable upper mold insert, a slider mechanism, a delayed square guide pin, an opening, an overflow trough, a feeding cavity, an electric heating hole, no extrusion screw, and no flow channel.

[0007] The upper mold is composed of an upper mold plate, an upper mold core, and a detachable upper mold insert, and the lower mold is composed of a lower mold plate, a lower mold core, and a slider mechanism.

[0008] The upper die core is installed on the upper die plate, the lower die core is installed on the lower die plate, and the detachable upper die insert is installed on the upper die core.

[0009] There are two slider mechanisms, which are installed on both sides of the lower template. The delayed square guide pillars are installed on the slider mechanisms, and the openings are installed on the upper template, and their positions correspond to the delayed square guide pillars.

[0010] The slider mechanism slides toward the lower mold core until the two fit together and the lower mold forms a closed cavity; the delayed square guide pin passes through the opening to lock the slider mechanism.

[0011] The electric heating holes are evenly distributed in the upper mold plate, and several temperature sensors are installed to display the temperature of each area inside the mold in real time.

[0012] The overflow chute is located in the feeding cavity, surrounds the feeding cavity, and is contoured to the BMC&SMC electrical products. It has a depth of 2 mm and is 1.5 to 2.5 mm away from the edge of the feeding cavity.

[0013] The processing method includes: assembling an upper mold and fixing it on the upper table of a machine tool; assembling a lower mold and fixing it on the lower table of a machine tool, and feeding BMC&SMC thermosetting compression plastic into a feeding cavity; adjusting the mold height, starting the machine tool, closing the upper and lower molds, and forming a closed cavity between the upper and lower mold cores; heating the mold through an electric heating hole; the BMC&SMC thermosetting compression plastic is in a molten state and enters the mold core cavity; forming a BMC&SMC electrical product, and excess BMC&SMC thermosetting compression plastic flows out from an overflow trough.

[0014] The slider mechanism slides toward the lower mold core until the two fit together, forming a closed cavity in the lower mold, and the delayed square guide pin passes through the opening to lock the slider mechanism.

[0015] According to the weight of BMC&SMC electrical products, materials are added by weight and heated to 150 degrees. The temperature of each area inside the mold is displayed in real time through the temperature probe sensor.

[0016] The present invention has no extrusion screw, no flow channel, only a feeding cavity, and feeds by weight, so the material amount can be controlled more accurately, waste can be reduced, cost can be reduced, flash can be reduced, and the workload of de-flashing can be reduced; a detachable insert is installed in the closed cavity, which is beneficial to exhaust and molding, and disperses the pressure and resistance on the molding surface; the mold and the material are heated evenly, the temperature is detected at multiple points, and the temperature is displayed in real time to prevent product deformation, cracks, and dimensional errors; an overflow groove is arranged around the cavity, the burrs produced are particularly thin and easy to handle, and the product size can be precisely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the upper mold structure diagram. Figure 2 This is the lower mold structure diagram.

[0018] Figure markings: 1-lower template, 2-lower mold core, 3-slider mechanism, 4-delayed square guide pin, 5-BMC&SMC electrical products, 6-overflow trough, 7-feeding cavity, 8-upper template, 9-detachable upper mold insert, 10-upper mold core, 11-electric heating hole, 12-opening. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0020] The upper mold structure of the mold is as follows Figure 1 As shown, it includes an upper mold plate 8, a detachable upper mold insert 9, an upper mold core 10, and an electric heating hole 11; the lower mold structure of the mold is as shown Figure 2 As shown, it includes a lower mold plate 1, a lower mold core 2, a slider mechanism 3, a delayed square guide pin 4, an overflow trough 6, and a feeding cavity 7; wherein the BMC&SMC electrical product 5 is formed in the mold without an extrusion screw and a flow channel.

[0021] The detachable upper die insert is installed on the upper die core, which is beneficial to exhaust and molding, and disperses the pressure and resistance on the molding surface. The upper die core is installed on the upper mold plate. The upper mold plate, the upper die core, and the detachable upper die insert constitute the upper mold. The upper mold is assembled and fixed on the upper table of the machine tool.

[0022] There are two slider mechanisms installed on both sides of the lower template. The lower die core is installed on the lower template. The lower template, the lower die core and the slider mechanism constitute the lower die. When the lower die is assembled, the slider mechanism slides toward the lower die core until the two fit together. The lower die forms a closed cavity and is fixed to the lower table of the machine tool.

[0023] According to the weight of BMC&SMC electrical products, materials are fed by weight, which can control the material quantity more accurately, reduce waste, reduce costs, reduce flash, and reduce the workload of de-flashing.

[0024] BMC&SMC thermosetting plastic is put into the feeding cavity, the delayed square guide pin is installed on the slider mechanism, the opening is installed on the upper template, the position corresponds to the delayed square guide pin, the mold height is adjusted, the machine tool is started, the upper and lower molds are closed, the delayed square guide pin passes through the opening, locks the slider mechanism, and the upper and lower mold cores form a closed cavity.

[0025] The electric heating holes are evenly distributed in the upper mold plate to evenly heat the mold and the material. Several temperature sensors are installed to detect the temperature at multiple points. The mold is heated through the electric heating holes. The BMC&SMC thermosetting plastic is in a molten state and enters the mold core cavity. The temperature of each area inside the mold is displayed in real time and heated to 150 degrees to prevent product deformation, cracks, and size errors. BMC&SMC electrical products are formed.

[0026] The overflow chute is located in the feeding cavity, surrounding the feeding cavity, and conforming to the BMC&SMC electrical products. The depth is 2 mm, and the distance from the edge of the feeding cavity is 1.5 to 2.5 mm. The excess BMC&SMC thermosetting extrusion plastic flows out of the overflow chute, and the burrs are particularly thin and easy to handle, and the product size can be precisely controlled.

[0027] The above are embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A BMC&SMC thermosetting compression molding electrical mold, It is characterized in that include: Upper template, lower template, upper die core, lower die core, detachable upper die insert, slider mechanism, delayed square guide pins, openings, overflow troughs, feeding cavity, electric heating holes; upper template, upper die core, detachable upper die insert constitute the upper mold, lower template, lower die core, slider mechanism constitute the lower mold; upper die core is installed on the upper template, lower die core is installed on the lower template, detachable upper die insert is installed on the upper die core; there are two slider mechanisms, which are installed on both sides of the lower template, delayed square guide pins are installed on the slider mechanism, and the openings are installed on the upper template, and the positions correspond to the delayed square guide pins; the electric heating holes are evenly distributed in the upper template, and the overflow troughs are located in the feeding cavity; the mold has no extrusion screw and no flow channel.

2. The BMC&SMC thermosetting compression molding electrical mold according to claim 1, It is characterized in that The lower mold plate, lower mold core, slider mechanism, delayed square guide pin, and opening include: the slider mechanism slides toward the lower mold core until the two fit together and the lower mold forms a closed cavity; the delayed square guide pin passes through the opening and locks the slider mechanism.

3. The BMC&SMC thermosetting compression molding electrical mold according to claim 1, It is characterized in that The electric heating hole includes: installing a plurality of temperature detection sensors to display the temperature of each area inside the mold in real time.

4. The BMC&SMC thermosetting compression molding electrical mold according to claim 1, It is characterized in that The overflow chute includes: a circumference of the feeding cavity, and a shape matching that of the BMC&SMC electrical product.

5. The BMC&SMC thermosetting compression molding electrical mold according to claim 4, It is characterized in that The overflow groove includes: a depth of 2 mm and a distance of 1.5 to 2.5 mm from the edge of the feeding cavity.

6. A method for processing BMC&SMC thermosetting compression molding electrical molds, It is characterized in that include: The BMC&SMC thermosetting compression molding electrical mold according to claim 1 is used to assemble the upper mold and fix it on the upper table of the machine tool; assemble the lower mold and fix it on the lower table of the machine tool, and put the BMC&SMC thermosetting compression molding plastic into the feeding cavity; adjust the mold height, start the machine tool, close the upper and lower molds, and form a closed cavity with the upper and lower mold cores; heat the mold through the electric heating hole; the BMC&SMC thermosetting compression molding plastic is in a molten state and enters the mold core cavity; form a BMC&SMC electrical product, and the excess BMC&SMC thermosetting compression molding plastic flows out from the overflow trough.

7. The method for processing a BMC&SMC thermosetting compression molding electrical mold according to claim 6, It is characterized in that The assembly of the lower die comprises: a slider mechanism slides toward the lower die core until the two are fitted together, and the lower die forms a closed cavity.

8. The method for processing a BMC&SMC thermosetting compression molding electrical mold according to claim 6, It is characterized in that The method of closing the upper and lower molds includes: a delayed square guide pin passes through the opening to lock the slider mechanism.

9. The method for processing a BMC&SMC thermosetting compression molding electrical mold according to claim 6, It is characterized in that The BMC&SMC thermosetting compression plastic is fed into the feeding cavity, including: feeding in a weight-based manner according to the weight of the BMC&SMC electrical product.

10. The method for processing a BMC&SMC thermosetting compression molding electrical mold according to claim 6, It is characterized in that The heating of the mold through the electric heating hole includes: heating to 150 degrees, and displaying the temperature of each area inside the mold in real time through a temperature detection sensor.

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