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CN-117774203-B - Method for rapid hot-press forming and punching of composite board

CN117774203BCN 117774203 BCN117774203 BCN 117774203BCN-117774203-B

Abstract

The invention provides a method for rapidly hot-pressing and forming a die-cut composite plate, which is applied to a die with a rapid temperature rise and fall die pipeline system and a die internal cutting mechanism, and comprises the steps of placing the plate; the temperature of the die is adjusted to be between Tg and Tm of thermoplastic plastics in the composite board, the first-stage die assembly is carried out, the composite board is heated, the second-stage die assembly is carried out, the composite board is heated and pressed for molding, the first-stage cooling is carried out, the die is cooled to be below HDT of the composite board, the product stub bar is punched, the second-stage cooling is carried out, the composite board is cooled and pressed for molding, the finished product is taken out, and the die is opened after the die is cooled to normal temperature, and the finished product is taken out. The invention can save working sections, reduce reject ratio, avoid the diffusion of harmful gas and smoke dust, and can rapidly and stably carry out hot press molding and punching on the composite board.

Inventors

  • WU ZHENGDAO
  • LIAO YIJIE
  • LIU MINGQIANG

Assignees

  • 汉达精密电子(昆山)有限公司

Dates

Publication Date
20260512
Application Date
20220922

Claims (7)

  1. 1. The method for rapidly hot-press forming and punching the composite board is applied to a die with a rapid temperature rise and fall die pipeline system and a die inscribing mechanism, and is characterized by comprising the following steps: S1, placing a plate, namely placing the cut composite plate into a die; S2, adjusting the temperature of a die, namely, selecting a corresponding medium to enter a die pipeline to adjust the temperature of the die, wherein the dependent factors of the temperature of the die include Tg (glass transition temperature), tm (melting temperature) and product pressing shape of the thermoplastic in the composite board, so that the temperature of the die reaches between the Tg (glass transition temperature) and Tm (melting temperature) of the thermoplastic in the composite board; S3, closing the die in the first stage, namely controlling the distance between the die and the composite board, wherein the distance depends on factors including the pressing shape of the product, and carrying out heat radiation and convection heating on the composite board by using the temperature of the die; s4, a second stage of die assembly, wherein the die assembly speed of the second stage is adjusted according to the thickness of the composite board and the shape of the product, and the die assembly is carried out while the thermal conduction heating is utilized for pressing and forming the composite board; s5, cooling in the first stage, namely selecting a corresponding medium to enter a mould pipeline, starting cooling in the first stage, and punching a product stub bar by using a die cutting mechanism after the temperature of the mould is cooled below the HDT (heat distortion temperature) of the composite board; S6, cooling in the second stage, namely continuously cooling the die and cooling the composite board until the die closing pressure is slowly reduced to zero, cooling the composite board in the die, and pressing and shaping the composite board under the die pressure; And S7, taking out the finished product, namely cooling the die to normal temperature, and opening the die to take out the finished product.
  2. 2. The method for rapid thermal compression molding of composite sheet material according to claim 1, wherein the thermoplastic plastic in the composite sheet material is PC (polycarbonate) with Tg (glass transition temperature) of 100-150 ℃ and Tm (melting temperature) of 220 ℃, the medium passing through the die line in S2 is water vapor of 160-170 ℃, and the medium passing through the die line in S5 is water of 15-30 ℃.
  3. 3. The method for rapid hot press forming and punching of composite boards according to claim 1, wherein the thermoplastic in the composite boards is PSU (polysulfone) with Tg (glass transition temperature) of 190 ℃ and Tm (melting temperature) of 288 ℃, the mold pipeline in S2 is firstly passed through 160-170 ℃ of water vapor, and when the temperature of the mold rises to 150 ℃, 250-280 ℃ of hot kerosene is selected to pass through the mold pipeline, so that rapid heating is realized, and the medium passed through the mold pipeline in S5 is 15-30 ℃ of water.
  4. 4. The method for rapid thermal compression molding of composite board according to claim 1, wherein the distance between the die and the composite board in S3 is 1 mm-5 mm.
  5. 5. The method for rapid thermal compression molding of composite sheet material according to claim 1, wherein the die clamping speed of the die in S4 is 0.1mm/sec to 3mm/sec.
  6. 6. The method for rapid thermal compression molding and punching of composite boards according to claim 1, wherein in S5, when the temperature of the die is reduced to HDT-50-30 ℃, the product stub bar is punched.
  7. 7. A method of rapid thermal compression forming die-cut composite sheet material as defined in claim 1 or 3 wherein the die lines blow-dry the die lines with air prior to converting the medium through the die lines to remove the medium from the die lines to prevent the die lines from bursting due to reaction between different mediums during the conversion of the medium in the die lines.

Description

Method for rapid hot-press forming and punching of composite board [ Field of technology ] The invention relates to the technical field of composite board forming, in particular to a method for rapidly hot-press forming and punching a composite board. [ Background Art ] The process of hot-press forming and punching the composite board is generally to heat the composite board outside a die by an external heating furnace and then put the composite board into the die, or stretch the composite board into the hot-press forming die by an infrared baking tray to heat the composite board, then hot-press forming the composite board, and then moving the hot-pressed product to a punching working section to punch the stub bar of the hot-pressed composite board, so that a finished product is obtained, but the following problems occur when the composite board is heated outside by the external heating furnace and then put into the die to hot-press form the composite board: 1. the clamping and positioning are not easy, namely the material is softened when the heating furnace is heated to the temperature above Tg (glass transition temperature) of the composite board, the clamping and positioning are not easy, and a more precise product cannot be applied; 2. The temperature reproducibility is poor, namely the temperature of the heated composite board continuously drops in the process of clamping and moving the heated composite board from a heating furnace to a die, and the temperature is easily influenced by external environment, so that the temperature variation of the board is larger when hot pressing is carried out, and especially the heat dissipation of the thinner composite board is faster, and the influence of hot pressing is larger; 3. the quality of the product is reduced, namely, when the composite board with high Tg (glass transition temperature) is heated to high temperature, resin and additives in the board volatilize, so that the resin is lost, and the mechanical property and the surface appearance quality of the product after hot press molding are reduced; 4. Environmental pollution the resin and additives volatilized when the composite board with high Tg (glass transition temperature) is heated to high temperature can generate dense smoke and pollute the production environment. The infrared baking tray is adopted to extend into the hot-press forming die for heating, the problem that clamping and positioning are difficult to occur is avoided, other problems exist, and when the composite board after hot-press forming is moved to a punching working section for punching, if the dimensional accuracy of a product is higher, the punching working section is difficult to accurately position the composite board after hot-press forming. In view of the above, the present invention provides a method for rapid hot press forming of die-cut composite sheet material to solve the above-mentioned problems. [ Invention ] The invention aims to solve the technical problems that products are difficult to clamp and position, poor in temperature reproducibility, reduced in product quality and environment-friendly due to the fact that a composite board is heated outside and then put into a die or stretched into the die by an infrared baking tray for hot press molding, and accurate positioning is difficult to realize when the composite board after hot press molding is moved to a punching stub bar of a punching section, and provides a method for rapidly hot press molding and punching the composite board. The invention solves the technical problems that the method for rapidly hot-pressing and forming the die-cut composite board is applied to a die with a rapid temperature rise and fall die pipeline system and a die inscribing mechanism, and comprises the following steps: S1, placing a plate, namely placing the cut composite plate into a die; S2, adjusting the temperature of a mould, namely selecting a corresponding medium to enter a mould pipeline to adjust the temperature of the mould, wherein the temperature of the mould depends on factors such as Tg (glass transition temperature), tm (melting temperature) and product pressing shape of the thermoplastic plastics in the composite board, so that the temperature of the mould reaches between the Tg (glass transition temperature) and Tm (melting temperature) of the thermoplastic plastics in the composite board; S3, in the first stage, die assembly, namely controlling the distance between the die and the composite board, wherein the distance depends on factors such as the pressing shape of a product, and the like, and carrying out heat radiation and convection heating on the composite board by utilizing the temperature of the die; s4, a second stage of die assembly, wherein the die assembly speed of the second stage is adjusted according to the thickness of the composite board and the shape of the product, and the die assembly is carried out while the thermal conduction heating is utilized fo