CN114347345B - Pulse type thermoplastic composite material product forming device and application method thereof - Google Patents
Pulse type thermoplastic composite material product forming device and application method thereof Download PDFInfo
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- CN114347345B CN114347345B CN202210038335.7A CN202210038335A CN114347345B CN 114347345 B CN114347345 B CN 114347345B CN 202210038335 A CN202210038335 A CN 202210038335A CN 114347345 B CN114347345 B CN 114347345B
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- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 17
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- 239000000523 sample Substances 0.000 claims abstract description 58
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- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004321 preservation Methods 0.000 abstract description 4
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- 238000013500 data storage Methods 0.000 description 2
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Abstract
The pulse thermoplastic composite material product forming device comprises a die shell, wherein the die shell is arranged in a surrounding mode so that a cavity for containing composite materials is formed in the middle of the die shell, a plurality of heating bodies and a temperature measuring part are arranged on the die shell, and the temperature measuring part comprises a main temperature measuring probe matched with the heating bodies and an auxiliary temperature measuring probe for measuring the temperature of the die; the main temperature measuring probe is used for measuring the center temperature, the auxiliary temperature measuring probe is used for measuring the edge temperature, and an association relation is arranged between the edge temperature and the heating elements; the device also comprises a control device, wherein the control device realizes the stabilization of the center temperature and the edge temperature through the control of the heating body. The main temperature measurement probe is used for measuring the temperature of the heating body, the auxiliary temperature measurement probe is used for measuring the edge temperature to represent the temperature of a product, and the temperature inside the forming device has better control capacity, so that more optimal temperature distribution, temperature rising and heat preservation effects are obtained.
Description
Technical Field
The application relates to a pulse type thermoplastic composite material product forming device and a using method thereof.
Background
In the field of composite materials, compression molding (also called compression molding or compression molding) is a process in which a powdery, granular or fibrous resin and a fabric are put into a mold cavity at a molding temperature, and then the mold is closed and pressurized to be molded and cured. Compression molding can be used for both thermoset, thermoplastic and rubber materials. In the field of composite article preparation, compression molding is the most common preparation method, but the disadvantages are also obvious, namely: low molding efficiency and poor uniformity of product performance. These disadvantages are mainly caused by: firstly, the temperature rising rate of the die is low, the energy loss is large, and the energy utilization rate is low; secondly, the temperature of the die is not uniform enough, the temperature difference between the heating element area and the heating element-free area is too large, and the temperature stability of the die can not be well controlled.
In the prior compression molding process equipment, an electric heating rod is generally adopted for heating, a single-point or few temperature measuring points are adopted for sampling to replace the monitoring of the temperature of the whole mold, and in the heating process, the heating area of the electric heating rod is limited, and finally, the self heat conductivity of the metal material of the mold is essentially relied on for distributing heat, so that the whole temperature of the mold is uneven, the condition that the high-temperature point and the low-temperature point exist on the same surface of the mold is inevitable, and the temperature difference between the high-temperature point and the low-temperature point is larger. Also, in the constant temperature process, it is difficult to control the mold temperature within a certain effective range due to the heating/cooling inertia of the electric heating rod and the temperature conduction inertia of the mold metal plate, and the composite product tends to be sensitive to the molding temperature, which causes contradiction between the molding process equipment and the composite process. How to realize the rapid temperature rise of the compression molding die to improve the efficiency, and to stabilize and efficiently control the uniformity and the precision of the temperature to improve the product performance becomes a difficult problem to be solved by the compression molding process.
Disclosure of Invention
In order to solve the above problems, the present application proposes a pulse thermoplastic composite product forming device, which includes a mold shell, wherein the mold shell is arranged around to form a cavity for accommodating composite material in the middle part, a plurality of heating elements and a temperature measuring part are arranged on the mold shell, and the temperature measuring part includes a main temperature measuring probe matched with the heating elements and an auxiliary temperature measuring probe for measuring the temperature of the mold; the main temperature measuring probe is used for measuring the center temperature, the auxiliary temperature measuring probe is used for measuring the edge temperature, and an association relation is arranged between the edge temperature and the heating elements; the device also comprises a control device, wherein the control device realizes the stabilization of the center temperature and the edge temperature through the control of the heating body. The main temperature measuring probe is used for measuring the temperature of the heating body, the auxiliary temperature measuring probe is used for measuring the edge temperature to represent the temperature of a product, so that the temperature inside the forming device can be better controlled, and more optimal temperature distribution, temperature rising and heat preservation effects are obtained.
Preferably, the control device comprises a power management device for managing heating power of the heating element and a controller for acquiring temperatures of the main temperature measurement probe and the auxiliary temperature measurement probe and sending a control strategy to the power management device by combining the association relation.
Preferably, the mold housing includes an upper cover body, an annular protection plate disposed below the upper cover body, and a lower cover body disposed below the annular protection plate.
Preferably, the upper cover body comprises a measuring plate and a heating plate which are arranged in a separable way; a plurality of heating chambers are arranged in the heating plate, the heating body is arranged in the heating chambers, a main temperature measuring probe is arranged at a position, opposite to the heating chambers, on the measuring plate, an auxiliary temperature measuring probe is arranged at the edge of the measuring plate, and the auxiliary temperature measuring probe is arranged between the adjacent heating chambers; the lower cover body and the upper cover body are symmetrically arranged. This application is guaranteeing main temperature probe and supplementary temperature probe functionality in, still guarantees its own easy assemblability through the design of structure, avoids needing too high assembly precision to realize under the low-cost prerequisite, reach more optimized temperature control effect through setting up on the overall arrangement.
Preferably, an auxiliary temperature measuring probe is also arranged between the corner of the measuring plate and the heating element.
Preferably, the die shell is a flat heating die or other regular and irregular dies or a three-dimensional surrounding die;
the heating body is in an electric energy heating mode, and the heating capacity is regulated and controlled by voltage and current; the heating element is a ceramic heating plate or a heating rod or an infrared heating tile or a pulse heating element;
the temperature measuring part is a thermocouple probe or a thermal resistance probe or an infrared temperature measuring probe.
Preferably, the power management device is an intensive multipath self-adjusting power supply, receives the control management of the control device, realizes intensive control on the heating element, and realizes the heating and temperature control process according to the real-time heating element temperature and the temperature feedback of the peripheral temperature measuring part;
the control device is a computer or an embedded control system and performs the functions of temperature and other data acquisition, control, algorithm execution and data storage.
Preferably, the temperature measuring part further comprises a temperature measuring collector, the temperature measuring collector is a multi-channel collector, 32 channels are supported at maximum and provided with a communication function, and temperature data of all the accessed channels can be sent to the control device in a communication mode.
On the other hand, the application also discloses a using method of the pulse type thermoplastic composite material product forming device, which comprises the following steps: placing the composite material in a molding device;
the forming device is heated and is divided into a heating section and a constant temperature section,
the temperature rising section adopts multi-gradient high-pressure rapid heating;
the constant temperature section is used for heat preservation in a small voltage transformation coarse tuning and constant voltage pulsating current supplementing fine tuning mode.
Preferably, the temperature raising section includes the steps of: the control system obtains an initial temperature and a stop temperature, a power supply management device is utilized to realize variable voltage pulse heating and rapid temperature rise, the rapid temperature rise is in temperature gradient arrangement, a heating body can rapidly heat respective responsible areas, the temperature gradient ensures the conduction of heat of the die, the voltage of the heating body is fed back and adjusted according to a preset PID control depth under different temperature rise gradients, and the rapid temperature rise of the die is realized through voltage transformation;
the constant temperature section comprises the following steps: the power management device realizes heat dissipation and supplementary dynamic balance under temperature maintenance through current pulse type heating and temperature compensation under constant voltage, when a control system monitors that the local temperature is higher or lower to maintain the uniformity of the temperature of the die, an instruction is sent to the power management device, the power management device coordinates the peripheral heating bodies to calculate the pulse time and voltage of each heating body through equivalent threshold conversion, and the peripheral temperature is stabilized under the coordination of a plurality of heating bodies and the heat of a temperature abnormal region is supplemented or reduced to realize the temperature uniformity. According to the multi-variable-pressure pulse heating method, the temperature of the die is quickly and effectively increased by using the multi-variable-pressure pulse heating mode of the temperature increasing section, and the problem of low temperature increasing rate of the die is solved; the constant temperature section adopts a mode of rough adjustment of pressure regulation and fine adjustment of constant-pressure pulsating current to save energy and supplement temperature, so that the problems of overshoot and over-drop of the temperature of the die are overcome, and the maximum energy conservation and emission reduction are realized; the space area of the die is reasonably planned, heating bodies are densely distributed, the power supply intensive multichannel independent control is realized, and the pixel blocks are partitioned to realize the fine adjustment control of the local temperature of the die; and high stability of the die temperature is realized by guiding PID temperature control through deep negative feedback based on the temperature of the heating body and the die temperature.
The application can bring the following beneficial effects:
1. the main temperature measuring probe is used for measuring the temperature of the heating element, and the auxiliary temperature measuring probe is used for measuring the edge temperature to represent the temperature of a product, so that the temperature inside the forming device can be better controlled, and more optimal temperature distribution, heating and heat preservation effects are obtained;
2. the main temperature measuring probe and the auxiliary temperature measuring probe are ensured to be functional, meanwhile, the self easy assembly is ensured through the structural design, and the excessively high assembly precision is avoided, so that the more optimal temperature control effect is achieved through the arrangement on the premise of low cost;
3. according to the method, the die is heated rapidly and effectively by using a variable voltage pulse heating mode of the heating section, and the problem of low die heating rate is solved; the constant temperature section adopts a mode of rough adjustment of pressure regulation and fine adjustment of constant-pressure pulsating current to save energy and supplement temperature, so that the problems of overshoot and over-drop of the temperature of the die are overcome, and the maximum energy conservation and emission reduction are realized; the space area of the die is reasonably planned, heating bodies are densely distributed, the power supply intensive multichannel independent control is realized, and the pixel blocks are partitioned to realize the fine adjustment control of the local temperature of the die; and high stability of the die temperature is realized by guiding PID temperature control through deep negative feedback based on the temperature of the heating body and the die temperature.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a schematic layout of a temperature probe with an auxiliary temperature probe in the middle;
fig. 3 is a schematic side view of the present application.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the following detailed description will explain the present application by means of specific embodiments.
In a first embodiment, as shown in fig. 1-3, a pulse type thermoplastic composite product forming device comprises a die shell 1, wherein the die shell 1 is arranged in a surrounding mode so that a cavity 2 for containing composite materials is formed in the middle of the die shell, a plurality of heating bodies 3 and a temperature measuring part are arranged on the die shell 1, and the temperature measuring part comprises a main temperature measuring probe 4 matched with the heating bodies 3 and an auxiliary temperature measuring probe 5 for measuring the temperature of the die; the main temperature measuring probe 4 is used for measuring the center temperature, the auxiliary temperature measuring probe 5 is used for measuring the edge temperature, and an association relation is arranged between the edge temperature and the heating elements 3; the incidence relation here means that the temperature of the cavity 2 can be represented because the position of the edge temperature is similar to that of the cavity 2, after a certain calibration test or measurement test is carried out, the temperature inside the cavity 2, namely the temperature of the thermoplastic composite material, can be estimated directly through the edge temperature, so that production is guided on the basis, and part of probes can be directly arranged inside the cavity 2, so that the internal temperature is more accurately known, and experiments find that the mode of arranging the auxiliary temperature probes and the main temperature measuring probes 4 on the side surface can meet the precision of production control, and the thermal hysteresis of temperature measurement can be reduced. And a control device for stabilizing the center temperature and the edge temperature by controlling the heating body 3. The control device comprises a power supply management device for managing the heating power of the heating body 3 and a controller for acquiring the temperatures of the main temperature measuring probe 4 and the auxiliary temperature measuring probe 5 and sending a control strategy to the power supply management device by combining the association relation. The mold housing 1 includes an upper cover 6, an annular protection plate 7 provided below the upper cover 6, and a lower cover 8 provided below the annular protection plate 7. The upper cover body 6 comprises a measuring plate 9 and a heating plate 11 which are arranged in a separable way; a plurality of heating chambers 10 are arranged in the heating plate 11, the heating body 3 is arranged in the heating chambers 10, a main temperature measuring probe 4 is arranged at the position, opposite to the heating chambers 10, on the measuring plate 9, an auxiliary temperature measuring probe 5 is arranged at the edge of the measuring plate 9, and the auxiliary temperature measuring probe 5 is arranged between the adjacent heating chambers 10. An auxiliary temperature probe 5 is also provided between the corners of the measurement plate 9 and the heating element.
Of course, the shape of the mold housing 1 is not limited, and may be a flat heating mold, a regular and irregular mold of other shapes, or a three-dimensional surrounding mold; the heating body 3 is in an electric energy heating mode, and the heating capacity is regulated and controlled by voltage and current; the heating body 3 is a ceramic heating plate or a heating rod or an infrared heating tile or a pulse heating body 3; the temperature measuring part is a thermocouple probe or a thermal resistance probe or an infrared temperature measuring probe.
In addition, the lower cover 8 and the upper cover 6 can be symmetrically arranged to improve the uniformity of temperature and the effectiveness of temperature rise and constant temperature.
The power supply management device is an intensive multipath self-adjusting power supply, is controlled and managed by the control device, realizes intensive control on the heating body 3, and realizes heating and temperature control processes according to the real-time temperature of the heating body 3 and the temperature feedback of the peripheral temperature measuring part; the control device is a computer or an embedded control system and performs the functions of temperature and other data acquisition, control and algorithm execution and data storage, and of course, the control device can be a controller with control functions such as a computer and computer software, a PLC industrial control system, an embedded control system, an FPGA and the like.
The temperature measuring part also comprises a temperature measuring collector, the temperature measuring collector is a multi-channel collector, 32 channels are supported at maximum and provided with a communication function, and the temperature data of all the accessed channels can be sent to the control device in a communication mode.
When in use, the method comprises the following steps:
placing a thermoplastic composite material in a molding device;
the forming device is heated and is divided into a heating section and a constant temperature section,
the temperature rising section adopts multi-gradient high-pressure rapid heating;
the constant temperature section is insulated by a mode of small voltage transformation coarse adjustment and constant voltage pulsating current supplement fine adjustment.
The temperature rising section comprises the following steps: the control system obtains an initial temperature and a stop temperature, a power supply management device is utilized to realize variable voltage pulse heating and rapid temperature rise, the rapid temperature rise is in temperature gradient arrangement, the heating body 3 can rapidly heat the respective responsible areas, the temperature gradient ensures the conduction of the heat of the die, the voltage of the heating body 3 is fed back and regulated according to the preset PID control depth under different temperature rise gradients, and the rapid temperature rise of the die is realized through voltage transformation; the voltage regulating range is 24V-240V, and the pulse frequency is 0.05Hz-1KHz;
the constant temperature section comprises the following steps: the power management device realizes heat dissipation and supplementary dynamic balance under temperature maintenance through current pulse heating and temperature compensation under constant voltage, when a control system monitors that the local temperature is higher or lower, a command is sent to the power management device, the power management device coordinates the peripheral heating body to calculate the pulse time and voltage of each heating body 3 through equivalent threshold conversion, and the peripheral temperature is stabilized under the coordination of a plurality of heating bodies 3 and the heat of a temperature abnormal region is supplemented or reduced to realize temperature consistency.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (7)
1. A pulse thermoplastic composite product forming device, which is characterized in that: the temperature measuring device comprises a die shell, wherein the die shell is arranged in a surrounding mode so that a cavity for containing composite materials is formed in the middle of the die shell, a plurality of heating bodies and a temperature measuring part are arranged on the die shell, and the temperature measuring part comprises a main temperature measuring probe matched with the heating bodies and an auxiliary temperature measuring probe for measuring the temperature of the die; the main temperature measuring probe is used for measuring the center temperature, the auxiliary temperature measuring probe is used for measuring the edge temperature, and an association relation is arranged between the edge temperature and the heating elements; the device also comprises a control device, wherein the control device realizes the stabilization of the center temperature and the edge temperature through the control of the heating body;
the die shell comprises an upper cover body, an annular protection plate arranged below the upper cover body and a lower cover body arranged below the annular protection plate;
the upper cover body comprises a measuring plate and a heating plate which are arranged in a separable manner; a plurality of heating chambers are arranged in the heating plate, the heating body is arranged in the heating chambers, a main temperature measuring probe is arranged at a position, opposite to the heating chambers, on the measuring plate, an auxiliary temperature measuring probe is arranged at the edge of the measuring plate, and the auxiliary temperature measuring probe is arranged between the adjacent heating chambers;
the lower cover body and the upper cover body are symmetrically arranged;
the control device comprises a power supply management device for managing the heating power of the heating body and a controller for acquiring the temperatures of the main temperature measuring probe and the auxiliary temperature measuring probe and sending a control strategy to the power supply management device by combining the association relation;
the power supply management device is an intensive multipath self-adjusting power supply, is controlled and managed by the control device, realizes intensive control on the heating element, and realizes heating and temperature control processes according to real-time heating element temperature and temperature feedback of a peripheral temperature measuring part.
2. The pulse thermoplastic composite article forming device of claim 1, wherein: an auxiliary temperature measuring probe is also arranged between the corners of the measuring plate and the heating body.
3. The pulse thermoplastic composite article forming device of claim 1, wherein: the die shell is a flat plate heating die;
the heating body is in an electric energy heating mode, and the heating capacity is regulated and controlled by voltage and current;
the temperature measuring part is a thermocouple probe or a thermal resistance probe or an infrared temperature measuring probe.
4. A pulse thermoplastic composite article forming apparatus as defined in claim 3, wherein: the control device is a computer.
5. The pulse thermoplastic composite article forming apparatus of claim 4, wherein: the temperature measuring part also comprises a temperature measuring collector, the temperature measuring collector is a multi-channel collector, 32 channels are supported at maximum, the temperature measuring part has a communication function, and temperature data of all the accessed channels can be sent to the control device in a communication mode.
6. A method of using the pulse thermoplastic composite article forming apparatus of claim 1, wherein: the method comprises the following steps:
placing the composite material in a molding device;
the forming device is heated and is divided into a heating section and a constant temperature section,
the temperature rising section adopts multi-gradient high-pressure rapid heating;
the constant temperature section is insulated by a mode of small voltage transformation coarse adjustment and constant voltage pulsating current supplement fine adjustment.
7. The method of using a pulse thermoplastic composite article forming apparatus of claim 6, wherein: the temperature rising section comprises the following steps: the control device obtains an initial temperature and a stop temperature, a power supply management device is utilized to realize variable voltage pulse heating and rapid temperature rise, the rapid temperature rise is in temperature gradient arrangement, the heating body can rapidly heat the respective responsible areas, the temperature gradient ensures the conduction of the heat of the die, the voltage of the heating body is fed back and adjusted according to the preset PID control depth under different temperature rise gradients, and the rapid temperature rise of the die is realized through voltage transformation;
the constant temperature section comprises the following steps: the power management device realizes heat dissipation and supplementary dynamic balance under temperature maintenance through current pulse type heating and temperature compensation under constant voltage, when the control device monitors that the local temperature is higher or lower, the control device sends an instruction to the power management device, the power management device coordinates the peripheral heating body to calculate the pulse time and voltage of each heating body through equivalent threshold conversion, and the peripheral temperature is stabilized under the coordination of a plurality of heating bodies and the heat of a temperature abnormal region is supplemented or reduced to realize temperature consistency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210038335.7A CN114347345B (en) | 2022-01-13 | 2022-01-13 | Pulse type thermoplastic composite material product forming device and application method thereof |
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| CN202210038335.7A CN114347345B (en) | 2022-01-13 | 2022-01-13 | Pulse type thermoplastic composite material product forming device and application method thereof |
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| CN114347345B true CN114347345B (en) | 2024-03-26 |
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| CN217670658U (en) * | 2022-01-13 | 2022-10-28 | 山东明科电气技术有限公司 | Pulse type thermoplastic composite material product forming die |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004027517B4 (en) * | 2004-06-03 | 2007-05-10 | Francotyp-Postalia Gmbh | Arrangement and method for controlling a thermal transfer print head |
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- 2022-01-13 CN CN202210038335.7A patent/CN114347345B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499569A (en) * | 2015-12-24 | 2016-04-20 | 华中科技大学 | Active temperature field regulating and controlling system for manufacturing high-energy beam reinforced material and control method for active temperature field regulating and controlling system |
| CN105867472A (en) * | 2016-05-24 | 2016-08-17 | 重庆科瑞分析仪器有限公司 | System and method for controlling optical system of spectrometer to keep at constant temperature |
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