CN116872440A - Control method for exhaust molding of thermosetting injection molding machine - Google Patents
Control method for exhaust molding of thermosetting injection molding machine Download PDFInfo
- Publication number
- CN116872440A CN116872440A CN202310848284.9A CN202310848284A CN116872440A CN 116872440 A CN116872440 A CN 116872440A CN 202310848284 A CN202310848284 A CN 202310848284A CN 116872440 A CN116872440 A CN 116872440A
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- China
- Prior art keywords
- die
- injection
- gun barrel
- mold
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 229920001187 thermosetting polymer Polymers 0.000 title claims abstract description 33
- 238000000465 moulding Methods 0.000 title claims abstract description 24
- 238000001746 injection moulding Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 56
- 239000007924 injection Substances 0.000 claims abstract description 56
- 230000001070 adhesive effect Effects 0.000 claims abstract description 19
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 30
- 239000012768 molten material Substances 0.000 claims description 26
- 239000000155 melt Substances 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000000748 compression moulding Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 238000010137 moulding (plastic) Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000001723 curing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/80—Measuring, controlling or regulating of relative position of mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76732—Mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76866—Mould closing
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a control method for exhaust molding of a thermosetting injection molding machine, which comprises the following steps: preheating a die and a gun barrel; injecting a system melt adhesive; pre-closing a die; automatic exhausting of injection and mould; the pressurizing forming is carried out, and a certain gap is reserved between the two half molds, so that internal gas can be fully discharged, the injection pressure of the mold cavity is reduced, and the problem of appearance of a product caused by incomplete gas discharge is avoided. The method can effectively solve the problems of overlarge injection pressure and overlarge energy consumption in the existing thermosetting plastic molding process and incomplete exhaust in the existing exhaust mode.
Description
Technical Field
The invention relates to the technical field of control of injection molding machines, in particular to a control method for exhaust molding of a thermosetting injection molding machine.
Background
At present, with the increasing and application of plastic products, thermosetting plastics are also newly developed, and the thermosetting plastics are favored by the market due to the excellent characteristics of high voltage resistance, high temperature resistance, stable properties and the like, and the product demands are also increasing.
Because of the special properties of thermosets, there are significant differences in the molding process from thermoplastics. The existing thermosetting plastic molding process can ensure that the molded thermosetting plastic product has the advantages of good dimensional stability, strong heat resistance and high rigidity, and can meet the basic requirements of the thermosetting plastic product.
However, the existing molding process of thermosetting plastics has the following defects:
1. in the existing thermosetting plastic injection molding process, the molten material is often injected by a pressurizing injection method, and because the fluidity of the molten state of the thermosetting raw material is poor, the molten state thermosetting plastic is often injected into a mold cavity with large injection pressure, if the mold is not smoothly exhausted in the process of filling the mold cavity with the plastic, the injection pressure is larger, and the corresponding consumed energy consumption is larger;
2. the existing thermosetting plastic molding process generally discharges gas through a short-time pressure relief and mold loosening method, and the gas generated by the gas discharge method cannot be completely discharged out of the mold cavity, so that the appearance quality of plastic products is easily affected, and molten materials are easily dropped out of the mold cavity.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a control method for the exhaust molding of a thermosetting injection molding machine, which aims at solving the problems of high injection pressure and poor exhaust of the curing molding of thermosetting plastics and optimizes the existing thermosetting plastic molding process.
The invention is realized by adopting the following technical scheme:
a control method for exhaust molding of a thermosetting injection molding machine comprises the following steps:
step 1, preheating a gun barrel and a die: setting a target temperature for heating the mould and the gun barrel on the controller, and controlling the heating devices of the gun barrel and the mould to generate heat through the controller;
step 2, injecting a system melt adhesive: after preheating the gun barrel and the die, setting a required melt adhesive stroke on a controller, starting a melt adhesive action, plasticizing a plastic raw material into molten material in a molten state, filling the injection gun barrel until the melt adhesive action is finished, and monitoring the melt adhesive position in real time through an injection position feedback device;
step 3, pre-closing the die: after the glue melting action is finished, controlling the mould locking mechanism to lock the mould to a target position, so that a certain gap is reserved between the two half moulds, and the mould locking position is monitored in real time through a mould plate position feedback device;
step 4, automatic exhaust of melt injection and a die: after the die pre-assembly is completed, the injection mechanism starts injection, the molten material in the gun barrel is injected into the die cavity of the die to a preset injection position, and air in the die cavity and gas generated by the solidification reaction of the molten material when the molten material enters the die cavity in the injection process are discharged out of the die cavity through a gap between the two die halves;
step 5, compression molding: after the molten material is injected to a preset injection position, the mold closing system closes the mold and presses the mold, the injection system continues to perform injection until the molten material is heated, solidified and molded in the mold cavity, and the mold is opened to eject the product.
Further, in step 1, the preheating process of the barrel and the die is monitored by a temperature detector mounted on the barrel and the die, and the temperature detector feeds back the real-time temperature of the barrel and the die in real time.
Further, in step 1, a heating device and a temperature detector are installed on the gun barrel and the die, and the heating device is used for heating the die and the gun barrel.
Further, the controller is an upper computer for controlling the action of the whole injection molding machine, and is connected with the temperature detector and the heating device and used for controlling the operation of the temperature detector and the heating device.
Further, the die closing position is monitored in real time through a die plate position detection device, and the melt adhesive position and the injection position are monitored in real time through an injection position detection device.
Further, the plastic raw material is thermosetting plastic and derivative raw materials thereof, and the molding mode is heating curing molding.
Further, the gas comprises air in the mold cavity and gas generated by a reaction of heated molten material in the mold cavity.
Further, the upper computer can monitor the real-time temperature of the die and the gun barrel in real time, and then automatically adjust the output power of the die and the gun barrel heating device, so that the die or the gun barrel temperature is stably controlled at a temperature target value.
Further, the controller is coupled to the template position feedback device and the injection position feedback device.
Further, the gap size varies according to actual production needs.
Compared with the prior art, the invention has the beneficial effects that:
(1) Under the condition that the mold locking mechanism is not completely locked and a certain gap is reserved between the two half molds, the injection action is executed in advance, the pressure of a mold cavity in the injection process is reduced, the injection pressure in the injection process is further reduced, and the energy consumption in the injection process is reduced.
(2) In the injection process, the gas generated by the solidification reaction of the molten material in the mold cavity can be completely discharged from the gap between the two mold halves, so that the problem that the appearance quality of the plastic product is affected due to incomplete discharge of the internal gas is avoided, and the molten material is ensured not to fall out of the mold cavity.
Drawings
Fig. 1 is a process flow chart of a control method for exhaust molding of a thermosetting injection molding machine according to an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
Example 1
As in fig. 1:
a control method for exhaust molding of a thermosetting injection molding machine comprises the following steps:
step 1, preheating a gun barrel and a die: setting a target temperature T1 ℃ for heating the mould and a target temperature T2 ℃ for heating the gun barrel on the controller, and automatically controlling the heating devices of the gun barrel and the mould to generate heat through the controller;
step 2, injecting a system melt adhesive: after preheating the gun barrel and the die, setting a required melt adhesive stroke X1 on the controller, starting a melt adhesive action, plasticizing a plastic raw material into molten material in a molten state, filling the injection gun barrel until the melt adhesive action is finished, and monitoring the melt adhesive position in real time through an injection position feedback device;
step 3, pre-closing the die: after the glue melting action is finished, controlling the mould locking mechanism to clamp the mould to a target position Y1, keeping a certain gap d between the two half moulds, and monitoring the clamping position in real time through a template position feedback device;
step 4, automatic exhaust of melt injection and a die: after the die pre-assembly is completed, the injection mechanism starts injection, the molten material in the gun barrel is injected into the die cavity of the die to a preset injection position X2, and air in the die cavity and gas generated by a curing reaction of the molten material when the molten material enters the die cavity in the injection process are discharged out of the die cavity through a gap between the two die halves;
step 5, compression molding: after the molten material is injected to a preset injection position, the mold closing system closes the mold and presses the mold, the injection system continues to perform injection until the molten material is heated, solidified and molded in the mold cavity, and the mold is opened to eject the product.
In the embodiment, in step 1, the preheating process of the gun barrel and the die is monitored by a temperature detector arranged on the gun barrel and the die, and the temperature detector feeds back the real-time temperature of the gun barrel and the die in real time; the heating device and the temperature detector are arranged on the gun barrel and the die, and the heating device is used for heating the die and the gun barrel; the controller is an upper computer for controlling the action of the whole injection molding machine, is connected with the temperature detector and the heating device and is used for controlling the operation of the temperature detector and the heating device; the upper computer can monitor the real-time temperature of the die and the gun barrel in real time, so that the output power of the die and the gun barrel heating device is automatically adjusted, and the die or the gun barrel temperature is stably controlled at a temperature target value; the preheating temperature range of the gun barrel is 70-90 ℃, the preheating temperature of the die is 140-175 ℃, and the temperatures of the gun barrel and the die are transmitted to an upper computer in real time through a temperature detector in the process of pressurizing and forming after the gun barrel and the die are preheated, and the upper computer automatically adjusts corresponding heating devices, wherein the heating devices of the gun barrel and the die can be specifically heating rods, heating rings, a die temperature machine and the like.
In the embodiment, the die assembly position is monitored in real time by a die plate position detection device, and the melt adhesive position and the injection position are monitored in real time by an injection position detection device; the controller is matched with the template position feedback device and the injection position feedback device; the position monitoring device is an electronic ruler, the electronic ruler is arranged on a corresponding driving oil cylinder in the injection molding machine, when the oil cylinder moves, the voltage corresponding to the electronic ruler changes, the electronic ruler feeds back voltage to the upper computer, and the upper computer compares the position calibrated in advance with the voltage proportional relation according to the voltage value, so that the current position is obtained.
In this embodiment, the plastic material is a thermosetting plastic and its derivative material, and the molding mode is heat curing molding.
In this embodiment, the gas includes air within the mold cavity and the gas generated by the reaction of the heated melt within the mold cavity.
In this embodiment, the gap size is changed according to actual production requirements, and the specific size range is effective in ensuring that the molten material injected into the mold cavity can be smoothly exhausted, and the molten material cannot fall out of the mold cavity, and the common gap size is 2-5mm.
In this embodiment, in step 5, the injection operation is continued after the mold is locked, and the mold melt is continuously filled, so that a certain injection pressure can be ensured, the problem of backflow of the mold melt to the injection system is avoided, the compactness of the mold melt in the mold is ensured, and the problem of shrinkage of the product caused by the solidification reaction of the mold melt is solved.
In the embodiment, the processing requirements can be met by repeatedly opening the mold and exhausting, repeatedly starting high pressure and controlling the repeated injection according to the requirements of different thermosetting plastic parts.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (9)
1. The control method for the exhaust molding of the thermosetting injection molding machine is characterized by comprising the following steps of:
step 1, preheating a gun barrel and a die: setting a target temperature for heating the mould and the gun barrel on the controller, and controlling the heating devices of the gun barrel and the mould to generate heat through the controller;
step 2, injecting a system melt adhesive: after preheating the gun barrel and the die, setting a required melt adhesive stroke on a controller, starting a melt adhesive action, plasticizing a plastic raw material into molten material in a molten state, filling the injection gun barrel until the melt adhesive action is finished, and monitoring the melt adhesive position in real time through an injection position feedback device;
step 3, pre-closing the die: after the glue melting action is finished, controlling the mould locking mechanism to lock the mould to a target position, so that a certain gap is reserved between the two half moulds, and the mould locking position is monitored in real time through a mould plate position feedback device;
step 4, automatic exhaust of melt injection and a die: after the die pre-assembly is completed, the injection mechanism starts injection, the molten material in the gun barrel is injected into the die cavity of the die to a preset injection position, and air in the die cavity and gas generated by the solidification reaction of the molten material when the molten material enters the die cavity in the injection process are discharged out of the die cavity through a gap between the two die halves;
step 5, compression molding: after the molten material is injected to a preset injection position, the mold closing system closes the mold and presses the mold, the injection system continues to perform injection until the molten material is heated, solidified and molded in the mold cavity, and the mold is opened to eject the product.
2. The method for controlling the exhaust molding of a thermosetting injection molding machine according to claim 1, wherein: in step 1, the preheating process of the gun barrel and the die is monitored by a temperature detector arranged on the gun barrel and the die, and the temperature detector feeds back the real-time temperature of the gun barrel and the die in real time.
3. The method for controlling the exhaust molding of a thermosetting injection molding machine according to claim 1, wherein: in step 1, a heating device and a temperature detector are installed on the gun barrel and the die, and the heating device is used for heating the die and the gun barrel.
4. The method for controlling the exhaust molding of a thermosetting injection molding machine according to claim 1, wherein: the controller is an upper computer for controlling the action of the whole injection molding machine, and is connected with the temperature detector and the heating device and used for controlling the operation of the temperature detector and the heating device.
5. The method for controlling the exhaust molding of a thermosetting injection molding machine according to claim 1, wherein: the die assembly position is monitored in real time through a die plate position detection device, and the melt adhesive position and the injection position are monitored in real time through an injection position detection device.
6. The method for controlling the exhaust molding of a thermosetting injection molding machine according to claim 1, wherein: the plastic raw material is thermosetting plastic and derivative raw material thereof, and the molding mode is heating curing molding.
7. The method for controlling the exhaust molding of a thermosetting injection molding machine according to claim 1, wherein: the gas comprises air in the mold cavity and gas generated by a reaction of heated molten material in the mold cavity.
8. The method of claim 4, wherein the host computer monitors the temperature of the mold and the barrel in real time, and further automatically adjusts the output power of the mold and the barrel heater to control the temperature of the mold or the barrel at a target temperature.
9. The method of claim 1, wherein the controller is coupled to the die plate position feedback device and the injection position feedback device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310848284.9A CN116872440A (en) | 2023-07-11 | 2023-07-11 | Control method for exhaust molding of thermosetting injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310848284.9A CN116872440A (en) | 2023-07-11 | 2023-07-11 | Control method for exhaust molding of thermosetting injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116872440A true CN116872440A (en) | 2023-10-13 |
Family
ID=88263873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310848284.9A Pending CN116872440A (en) | 2023-07-11 | 2023-07-11 | Control method for exhaust molding of thermosetting injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116872440A (en) |
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2023
- 2023-07-11 CN CN202310848284.9A patent/CN116872440A/en active Pending
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