Thermosetting plastic processing fluidity detection mold and detection method

Abstract

The present invention relates to a thermosetting plastic processing fluidity detection mold, comprising an upper mold and a lower mold arranged up and down and capable of vertical relative movement, a detection channel with a constant cross-sectional shape is arranged above the lower mold along the length direction, the detection channel has an opening toward the upper mold, the lower mold is located at the edge of the opening and has a scale arranged along the length direction, the upper mold and the detection channel are correspondingly provided with a pressing block extending into the opening to extrude the thermosetting plastic when descending, one end of the detection channel is used as a starting end, the upper mold is vertically provided with a feeding channel corresponding to the starting end, and a hopper for pouring thermosetting plastic powder into the feeding channel and a plug for closing the feeding channel after the thermosetting plastic powder is poured are arranged above the upper mold. By adopting the above scheme, the present invention provides a thermosetting plastic processing fluidity detection mold and detection method for accurately measuring and detecting the processing fluidity of thermosetting plastics.

Description

Technical Field

[0001] The invention relates to the field of thermosetting plastic detection devices, in particular to a thermosetting plastic processing fluidity detection mold, and also to a detection method using the mold. Background Art

[0002] Thermosetting plastics can soften and flow when heated for the first time. When heated to a certain temperature, a chemical reaction occurs, cross-linking and solidification occurs, and the plastics become hard. This change is irreversible. After that, when heated again, the plastics can no longer soften and flow. It is with the help of this characteristic that the molding process is carried out. The plasticized flow during the first heating is used to fill the mold cavity under pressure, and then solidify into a product of a certain shape and size. This material is called thermosetting plastic. Therefore, processing fluidity has a huge impact on the production of thermosetting plastics (melamine, phenolic resin, etc.) compression molding, and it is very necessary to estimate a unified standard prediction for it.

[0003] The traditional testing method is to pour the softened thermosetting plastic onto a high-temperature platform, use a hydraulic press to squeeze the thermosetting plastic toward the platform to extend it outward, and finally estimate its extended area. This method is too rough and can hardly provide good support and reference for product improvement and enhancement.

[0004] In order to solve the above problems, the Chinese utility model patent with application number 201920425598.8 also discloses a phenolic molding compound fluidity detection device. A certain pressure and a certain temperature are maintained by a pressure rod, and the material is injected into a spiral metal mold. The fluidity of the material is measured according to the length of the spiral filled when the material hardens every 60 seconds. The spiral length is observed through the marking point. The detection device of this structure has the following disadvantages: ① The material enters the metal mold only after it is melted, and there is a loss of fluidity during the entry process; ② The material is pushed forward by the pressure rod from the tail end of the material, and the pressure at each position of the material is uneven; ③ The flow channel is spiral, and there is damping when turning during the flow process, which affects the normal flow; ④ The flow channel is spiral, and the scale is marked on the flow channel. Since the radius of the spiral flow channel changes all the time, the indication of the equidistant scale is too rough and cannot be used for rigorous comparison; ⑤ The flow channel is spiral, which increases the difficulty of processing, reduces the accuracy and increases the processing cost. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a thermosetting plastic processing fluidity detection mold for accurately measuring and detecting the processing fluidity of thermosetting plastics.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: comprising an upper mold and a lower mold which are arranged up and down and can move vertically relative to each other, a detection channel with a constant cross-sectional shape is arranged above the lower mold along the length direction, the detection channel has an opening facing the upper mold, the lower mold is located at the edge of the opening and is provided with a scale along the length direction, the upper mold and the detection channel are provided with a pressing block which extends into the opening to extrude the thermosetting plastic when descending, one end of the detection channel serves as a starting end, the upper mold is provided with a feeding channel vertically corresponding to the starting end, and a hopper for pouring thermosetting plastic powder into the feeding channel and a plug for closing the feeding channel after the thermosetting plastic powder is poured are provided above the upper mold.

[0007] By adopting the above technical scheme, a certain amount of thermosetting plastic is placed in the detection channel, and then the thermosetting plastic powder is heated to make it melt and flow, and then it is extruded by the pressing block to make the thermosetting plastic flow along the detection channel. After a certain period of time, the upper mold and the lower mold are separated, and the flow distance can be read through the scale. The flow distance is used as the precise flow index of the thermosetting plastic. The volume can be obtained by calculation, and the material amount, temperature, force, and action time are quantified. Different thermosetting plastics can be placed in and tested separately, and the obtained flow indexes can be accurately compared, which provides good support and reference for product improvement and improvement. In addition, the plug closes the feed channel to prevent the thermosetting plastic from overflowing. Compared with traditional detection equipment, ① the material is heated inside the mold to reduce the loss of fluidity; ② the pressing block continuously and evenly presses the material everywhere; ③ the flow channel is straight, which reduces the damping during the flow process, and the equidistant scale is more accurate, which can be used for rigorous comparison, easy to process, and improves the accuracy while reducing the processing cost.

[0008] The present invention is further configured as follows: the detection channel is provided with a sunken portion below the starting end, the pressing block is provided with an extending portion extending to the sunken portion, and the side of the sunken portion is provided with a guiding ramp gradually rising to the detection channel along the length of the lower mold.

[0009] By adopting the above technical solution, the sunken part is used to accommodate more thermosetting plastics, and the extended part can better squeeze the part out of the sunken part. At the same time, the guiding ramp makes the flow of the thermosetting plastic smoother, ensuring that the test data has sufficient reference and the test is carried out smoothly.

[0010] The present invention is further configured as follows: the other end of the detection channel relative to the starting end extends to the edge of the lower mold and is connected to the outside.

[0011] By adopting the above technical solution, the detection channel is connected to the outside world, so as to avoid the negative pressure caused by the reduction of the detection channel space hindering the descent of the upper mold and the flow of thermosetting plastic, thereby improving the detection accuracy.

[0012] The present invention is further configured as follows: guide pillars are vertically arranged on all sides above the lower mold, and guide holes for the guide pillars to pass through are vertically penetrated in the upper mold.

[0013] By adopting the above technical solution, the vertical guiding structure of the upper mold relative to the lower mold formed by the guide column and the guide hole ensures the lifting stability while facilitating the separation of the two, thereby facilitating the observation of the scale and the removal of the thermosetting plastic finished product.

[0014] The present invention is further configured as follows: the lower mold is located below the detection channel and is provided with a plurality of stripping holes connected to the detection channel, the stripping holes are provided with stripping rods whose upper end faces are flush with the bottom surface of the detection channel, and the lower mold is provided with a material lifting drive component that drives the stripping rod to rise and separates the thermosetting plastic from the detection channel.

[0015] By adopting the above technical solution, the ejector rod is driven up by the ejector drive to separate the thermosetting plastic from the detection channel, thereby realizing automatic material removal, which is beneficial to the efficiency of multiple continuous detections. At the same time, it avoids manual insertion of tools to separate them, which may cause damage to the lower mold and affect the subsequent detection accuracy.

[0016] The present invention also provides a method for detecting a mold for detecting fluidity of thermosetting plastics, and provides the following technical solutions:

[0017] a. Install the upper die and the lower die on the hydraulic press, and use a heating device to heat the hydraulic press, the upper die and the lower die to a specified temperature;

[0018] b. Weigh out a certain amount of thermosetting plastic powder, pour it into the detection channel through the hopper, remove the hopper and cover it with a plug;

[0019] c. Start the hydraulic press, apply a specified extrusion force to the upper die and start timing;

[0020] d. When the timing time is equal to the corresponding production process time, open the hydraulic press, separate the upper mold and the lower mold, and read the scale, which is the flow index of the thermosetting plastic.

[0021] By adopting the above technical solution, the material amount, temperature, force and action time are quantified, so that the flow index can be used for comparison between different thermosetting plastics, or the material amount, temperature, force and action time of the same thermosetting plastic are subjected to a single variable method to obtain the influence of temperature, force and action time on the thermosetting plastic, thereby providing good support and reference for the improvement and enhancement of the product. In addition, the hydraulic press, upper mold and lower mold are heated at the same time, so that the thermosetting plastic is heated more evenly, further improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1The structure of the specific embodiment of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The structure of the specific embodiment of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 A top view of the lower mold in a specific embodiment of the present invention;

[0025] Figure 4 It is a bottom view of the upper mold in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] like Figure 1 — Figure 4As shown, the present invention discloses a thermosetting plastic processing fluidity detection mold, comprising an upper mold 1 and a lower mold 2 which are arranged up and down and can move vertically relative to each other, a detection channel 21 with a constant cross-sectional shape is arranged above the lower mold 2 along the length direction, the detection channel 21 has an opening facing the upper mold 1, and the lower mold 2 is provided with a scale 22 along the length direction at the edge of the opening, the upper mold 1 and the detection channel 21 are correspondingly provided with a pressing block 11 which extends into the opening to extrude the thermosetting plastic when descending, one end of the detection channel 21 is used as a starting end 211, and a feeding channel 12 is vertically arranged on the upper mold 1 corresponding to the starting end 211, and a hopper 13 for pouring thermosetting plastic powder into the feeding channel 12 and a thermosetting plastic powder pouring hopper 13 are provided above the upper mold 1. After that, the plug 14 that closes the feed channel 12 is used, and a certain amount of thermosetting plastic is placed in the detection channel 21, and then the thermosetting plastic powder is heated to make it melt and flow, and then it is extruded by the pressing block 11 to make the thermosetting plastic flow along the detection channel 21. After a certain period of time, the upper mold 1 and the lower mold 2 are separated, and the flow distance can be read through the scale 22. The flow distance is used as the accurate flow index of the thermosetting plastic, and the material amount, temperature, force, and action time are quantified. Different thermosetting plastics can be placed in for separate testing, and the obtained flow indexes can be accurately compared, which provides good support and reference for the improvement and enhancement of the product. In addition, the plug 14 closes the feed channel 12 to prevent the thermosetting plastic from overflowing. Figure 1 is a schematic diagram of the hopper 13 being installed on the upper mold 1, and Figure 2 This is a schematic diagram of the plug 14 closing the feed channel 12 of the upper mold. Compared with traditional testing equipment, ① the material is heated inside the mold to reduce the loss of fluidity; ② the pressure block continuously and evenly presses the material everywhere; ③ the flow channel is straight to reduce damping during the flow process, and the equidistant scale is more accurate, which can be used for rigorous comparison, easy to process, and improves accuracy while reducing processing costs.

[0029] The detection channel 21 is provided with a sunken portion 212 below the starting end 211, the pressing block 11 is provided with an extension portion 111 extending to the sunken portion 212, and a guide ramp 213 is provided on the side of the sunken portion 212 and gradually rises to the detection channel 21 along the length of the lower mold 2. The sunken portion 212 is used to accommodate more thermosetting plastics, and the extension portion 111 can better extrude the portion out of the sunken portion 212. At the same time, the guiding ramp 213 is used to make the flow of the thermosetting plastic smoother, thereby ensuring that the detection data has sufficient reference and the detection is carried out smoothly.

[0030] The other end of the detection channel 21 relative to the starting end 211 extends to the edge of the lower mold 2 and is connected to the outside world, connecting the detection channel 21 with the outside world to avoid the negative pressure generated by the reduction of the detection channel 21 space hindering the descent of the upper mold 1 and the flow of thermosetting plastic, thereby improving the detection accuracy.

[0031] Guide pillars 23 are vertically arranged on all sides above the lower mold 2, and guide holes 15 for the guide pillars 23 to pass through are vertically penetrated in the upper mold 1. The vertical guiding structure of the upper mold 1 relative to the lower mold 2 formed by the guide pillars 23 and the guide holes 15 ensures the lifting stability while facilitating the separation of the two, thereby facilitating the observation of the scale 22 and the removal of the thermosetting plastic finished product.

[0032] The lower mold 2 is located below the detection channel 21 and is provided with a plurality of stripping holes 24 connected to the detection channel 21. A stripping rod 25 whose upper end surface is flush with the bottom surface of the detection channel 21 is provided in the stripping hole 24. The lower mold 2 is provided with a lifting drive 26 for driving the stripping rod 25 to rise and separate the thermosetting plastic from the detection channel 21. The lifting drive 26 generally adopts a cylinder. The stripping rod 25 is driven by the lifting drive 26 to rise and separate the thermosetting plastic from the detection channel 21, thereby realizing automatic stripping, which is beneficial to the efficiency of multiple continuous detections. At the same time, it avoids manual insertion of tools to separate them, which may cause damage to the lower mold 2 and affect the subsequent detection accuracy.

[0033] The present invention also provides a method for detecting a mold for detecting fluidity of thermosetting plastics, and provides the following technical solutions:

[0034] a. Install the upper die 1 and the lower die 2 on the hydraulic press, and use a heating device to heat the hydraulic press, the upper die 1 and the lower die 2 to a specified temperature;

[0035] b. Weigh out a certain amount of thermosetting plastic powder, pour it into the detection channel 21 through the hopper 13, remove the hopper 13, and cover it with the plug 14;

[0036] c. Start the hydraulic press, apply a specified extrusion force to the upper die 1 and start timing;

[0037] d. When the timing time is equal to the corresponding production process time, open the hydraulic press, separate the upper mold 1 from the lower mold 2, and read the scale 22, which is the flow index of the thermosetting plastic.

[0038] The material quantity, temperature, force and action time are quantified so that the flow index can be used for comparison between different thermosetting plastics, or the material quantity, temperature, force and action time of the same thermosetting plastic are subjected to a single variable method to obtain the influence of the material quantity, temperature, force and action time on the thermosetting plastic, thereby providing good support and reference for the improvement and enhancement of the product. In addition, the hydraulic press, upper mold 1 and lower mold 2 are heated at the same time so that the thermosetting plastic is heated more evenly, further improving the detection accuracy. Moreover, the upper mold 1 needs to be installed on the hydraulic press when pressing down.

Claims

1. A thermosetting plastic processing fluidity detection mold, characterized in that: It comprises an upper die and a lower die arranged up and down and vertically relatively movable, a detection channel with a constant cross-sectional shape is arranged above the lower die along the length direction, the detection channel has an opening toward the upper die, the lower die is located at the edge of the opening and is provided with a scale along the length direction, the upper die and the detection channel are provided with a pressing block extending into the opening to extrude the thermosetting plastic when descending, one end of the detection channel is used as a starting end, the upper die is provided with a feeding channel vertically corresponding to the starting end, a hopper for pouring thermosetting plastic powder into the feeding channel and a plug for closing the feeding channel after the thermosetting plastic powder is poured are provided above the upper die; The detection channel is provided with a sunken portion below the starting end, the pressing block is provided with an extension portion extending to the sunken portion, and the side of the sunken portion is provided with a guide ramp gradually rising to the detection channel along the length of the lower die; The other end of the detection channel relative to the starting end extends to the edge of the lower mold and is connected to the outside.

2. The thermosetting plastic processing fluidity detection mold according to claim 1, characterized in that: Guide pillars are vertically arranged on the four sides above the lower mold, and guide holes for the guide pillars to pass through are vertically penetrated in the upper mold.

3. The thermosetting plastic processing fluidity detection mold according to claim 1, characterized in that: The lower mold is located below the detection channel and is provided with a plurality of stripping holes connected to the detection channel. The stripping holes are provided with stripping rods whose upper end faces are flush with the bottom surface of the detection channel. The lower mold is provided with a material lifting drive component that drives the stripping rod to rise and separates the thermosetting plastic from the detection channel.

4. The method for detecting the mold for detecting the fluidity of thermosetting plastic processing according to claim 1 is characterized in that: a. Install the upper die and the lower die on the hydraulic press, and use a heating device to heat the hydraulic press, the upper die and the lower die to the specified temperature; b. Weigh out a certain amount of thermosetting plastic powder, pour it into the detection channel through the hopper, remove the hopper and cover it with a plug; c. Start the hydraulic press, apply a specified amount of extrusion force to the upper die and start timing; d. When the timing time is equal to the corresponding production process time, open the hydraulic press, separate the upper mold and the lower mold, and read the scale, which is the flow index of the thermosetting plastic.

Images