CN109605695B - Multi-stage mold locking molding method for injection molding machine - Google Patents
Multi-stage mold locking molding method for injection molding machine Download PDFInfo
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- CN109605695B CN109605695B CN201811295826.XA CN201811295826A CN109605695B CN 109605695 B CN109605695 B CN 109605695B CN 201811295826 A CN201811295826 A CN 201811295826A CN 109605695 B CN109605695 B CN 109605695B
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- 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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
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- 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
-
- 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
- B29C2045/7606—Controlling or regulating the display unit
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a multi-stage mode locking molding method of an injection molding machine, which comprises the following steps of S10: starting high pressure on an injection molding machine, and starting the injection molding machine to perform injection molding on the mold when the injection molding pressure reaches a preset first pressure value; s20: after delaying the preset time, controlling a template of the injection molding machine to move so as to open the mold, adjusting the injection molding machine to a preset first state, and performing primary injection pressure maintaining on the injection molding machine through the preset first state; s30: controlling the injection molding machine template to move to lock the mold, adjusting the injection molding machine to a preset second state, and continuously performing primary injection pressure maintaining on the injection molding machine through the preset second state; s40: and judging whether the first injection pressure maintaining of the injection molding machine is finished, if so, locking the mold, performing second injection pressure maintaining to mold the product, and if not, turning to the step S20. The invention improves the molding quality of products with large injection quantity, large volume and long production period by opening the mold and locking the mold for many times in the injection pressure maintaining process.
Description
Technical Field
The invention relates to the field of molding processes of injection molding machines, in particular to a multi-stage mold locking molding method of an injection molding machine.
Background
In the injection molding process of the injection molding machine, the product is affected by expansion with heat and contraction with cold, shrinkage easily occurs during cooling molding, the product percent of pass is reduced, and after the injection molding of the common injection molding machine, injection and pressure maintaining are needed to prevent the shrinkage of the product in a mold cavity.
However, for some products with large volume, large injection equivalent and long production period, because the product is often long in molding period, long in injection time and large in raw material consumption of a single product, the product lacks a corresponding injection molding process, and the molding quality of the product cannot be well guaranteed only through injection pressure maintaining.
Disclosure of Invention
The invention aims to provide a multi-stage mode locking molding method of an injection molding machine, which is used for solving the problems of poor molding quality of the injection molding product with large volume, large injection equivalent and long production period.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multi-stage mold locking molding method of an injection molding machine comprises the following steps:
s10: starting high pressure on an injection molding machine, and starting the injection molding machine to perform injection molding on the mold when the injection molding pressure reaches a preset first pressure value;
s20: after delaying the preset time, controlling a template of an injection molding machine to move so as to open the mold, adjusting the injection molding machine to a preset first state, and performing primary injection pressure maintaining on the injection molding machine through the preset first state;
s30: controlling a template of the injection molding machine to move so as to lock the mold, adjusting the injection molding machine to a preset second state, and continuously performing primary injection pressure maintaining on the injection molding machine through the preset second state;
s40: and judging whether the first injection pressure maintaining of the injection molding machine is finished, if so, locking the mold, performing second injection pressure maintaining to mold the product, and if not, turning to the step S20.
Further, the step S10 is preceded by the steps of:
s00: and controlling the injection molding machine to mold and brake.
Further, the step S10 is followed by the step of:
s11: when the multi-stage mode-locking molding signal is received, the process proceeds to step S20, and if the multi-stage mode-locking molding signal is not received, a preset injection pressure maintaining is performed to mold the product.
Further, the step S20 further includes the steps of:
s21: and judging whether the template moves to a preset position or whether the moving time of the template reaches a preset moving time, if so, entering the step S30.
Further, the moving distance of the template is 1-5 mm.
Furthermore, the injection molding machine further comprises a plunger pump, the preset first state comprises that the plunger pump is in a preset minimum flow state, and the preset second state comprises that the plunger pump is in a preset maximum flow state.
Furthermore, the injection molding machine further comprises a mold locking high-pressure proportional valve and a pull rod, the pull rod drives the injection molding machine template to move through pulling, and the pull rod is linked with the mold locking high-pressure proportional valve.
Furthermore, when the mould locking is carried out once, the mould locking pressure of the injection molding machine during mould locking is correspondingly improved once according to a preset pressure value.
By adopting the invention, the molding quality of the product is effectively improved through the process flow design of repeated die opening expansion and die locking extrusion, and the product molding quality of the injection molding product with large volume, large injection equivalent and long production period is ensured.
Drawings
FIG. 1 is a flow chart of a method for multi-stage mold clamping molding of an injection molding machine according to an embodiment of the present invention;
FIG. 2 is a schematic view of a multi-stage mold-locking molding process of an injection molding machine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a key for multi-stage mode locking function activation of an injection molding machine according to an embodiment of the present invention;
FIG. 4 is a schematic view of a parameter setting screen of an injection molding machine according to an embodiment of the present invention;
fig. 5 is a schematic view of a mold clamping and non-opening mechanism of an injection molding machine according to an embodiment of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
As shown in fig. 1, the present embodiment provides a multi-stage mold-locking molding method for an injection molding machine, comprising the steps of:
s10: starting high pressure on an injection molding machine, and starting the injection molding machine to perform injection molding on the mold when the injection molding pressure reaches a preset first pressure value;
s20: after delaying the preset time, controlling a template of an injection molding machine to move so as to open the mold, adjusting the injection molding machine to a preset first state, and performing primary injection pressure maintaining on the injection molding machine through the preset first state;
s30: controlling a template of the injection molding machine to move so as to lock the mold, adjusting the injection molding machine to a preset second state, and continuously performing primary injection pressure maintaining on the injection molding machine through the preset second state;
s40: and judging whether the first injection pressure maintaining of the injection molding machine is finished, if so, locking the mold, performing second injection pressure maintaining to mold the product, and if not, turning to the step S20.
When the injection molding machine molds a product with long production period, large injection equivalent and large volume, the molded product is influenced by the factors of long molding period, long injection time and large volume, the molding quality is low, the product qualification rate is not high, and the injection molding process method provided by the embodiment can effectively improve the product quality and enable the product molding to be more perfect.
It should be understood that the mold opening in this embodiment is slightly opened, i.e. the distance that the mold plate moves is short, and is controlled within 1-5 mm.
Before step S10, step S00 is further included, where the injection molding machine is controlled to perform mold closing and brake holding.
Before injection molding of the injection molding machine, corresponding preparation is needed, and the mold closing device of the injection molding machine mainly comprises a front fixed template, a rear fixed template, a movable template, a pull rod and a movable template driving device. Before injection molding of an injection molding machine, mold closing is needed, and an integral mold cavity is formed in the mold after mold closing. The internal contracting brake is an internal contracting action and can be fully locked after passing through the internal contracting brake.
In step S10, the general injection molding machine needs to start high pressure before injection molding, and a first pressure value, i.e. an injection pressure value, is preset, and after the injection molding machine starts high pressure, the injection molding machine can normally perform injection molding only when the preset first pressure value is reached.
In step S20, after the injection action of the injection molding machine is started, the molten plastic is in the cavity of the mold, and after a preset time, the molten plastic can be preliminarily molded in the cavity, which is the preset time, and the preset time can be set according to actual conditions.
The mold opening of the injection molding machine is controlled by the pull rods, in the embodiment, the pull rods are provided with four pull rods in total, and the four pull rods act and are matched with corresponding valves to drive the mold plate to act and move. It should be noted that the moving distance of the mold plate is relative to other objects, and the moving distance of the mold plate is very small in the mold opening process, and the moving distance of the mold plate is 1-5 mm. In this embodiment, the moving distance of the die plate is set at 3 mm.
In this embodiment, the preset first state includes that the plunger pump is in a preset minimum flow state, wherein the plunger pump realizes oil absorption and oil pressing by means of the volume change of the sealed working cavity due to the reciprocating motion of the plunger in the cylinder body. When the plunger pump is in a preset minimum flow state, the plunger moves slowly, the mold locking force of the injection molding machine is small, the mold plate can move slightly, and at the moment, the injection molding machine still injects molten plastic into the mold cavity.
Before step S30, step S21 is further included, and it is determined whether the template moves to the preset position or whether the moving time of the template reaches the preset moving time duration, if yes, step S30 is performed.
The template can relatively move in the mold opening process, the movement of the template is limited by position or time, when the template moves to a preset position or the movement time of the template reaches a preset movement time, the threshold value is reached, and at the moment, the template needs to perform reverse return motion to return to the original mold locking state.
Furthermore, when the mold locking is carried out once, the mold locking pressure of the injection molding machine during mold locking is correspondingly improved once according to a preset pressure value.
Referring to fig. 4, in fig. 4, the clamping force is continuously increased as the number of clamping times is increased, and after four clamping times, the clamping force is increased from 1000 to 2000.
The preset moving time length and the preset position may be set, as shown in fig. 4, and fig. 4 further has a clamping force setting function, when the template is returned to the clamping state by the returning motion, the clamping force may be set to a preset maximum flow rate state that the plunger pump has,
in step S30, the preset second state of the injection molding machine includes the plunger pump being in a preset maximum flow state. Wherein, when the plunger pump is in the maximum flow state of predetermineeing, the mode locking pressure of mode locking is the biggest to can make the injection pressure of injection machine adjust bigger, in order to reach the mode locking pressure, at this moment through higher injection pressure, guarantee the extrusion that the product can be abundant, improve the shaping quality of product.
In steps S20 and S30, the first injection pressure maintaining means that the injection molding machine injects molten plastic into the cavity of the mold after starting, and at this time, the injection molding machine is required to perform injection pressure maintaining to keep a certain injection amount to prevent the plastic from shrinking and shrinking during condensation due to thermal expansion and cold contraction, and the first injection pressure maintaining is performed throughout the whole mold opening and mold locking process.
In step S40, the time length of the first injection pressure maintaining is set to be the time required for completing the four-time mold opening and mold locking, that is, after mold opening and mold locking are repeatedly performed for multiple times, the first injection pressure maintaining is completed, at this time, the second injection pressure maintaining is directly performed after mold locking, and after the second injection pressure maintaining, the product is molded.
Through the repeated die opening and die locking, the pressure maintaining is synchronous with the first injection, the micro expansion is carried out during the die opening, the die locking force is improved again during the die locking for extrusion, the forming quality of products is improved, and particularly, the repeated expansion and extrusion are carried out on products with large volume, large injection equivalent and long production period, so that the forming effect of the products is better.
Example two
As shown in fig. 2, the present embodiment provides a multi-stage mold-locking molding method of an injection molding machine, and is different from the first embodiment in that a proportional pressure valve, a shut-off valve, and a mold-locking high-pressure proportional valve are additionally provided.
The new proportional pressure valve, the cut-off valve and the mold locking high-pressure proportional valve are arranged in a mold locking hydraulic system of the injection molding machine and used for controlling the micro-opening and mold locking processes of the cooperative template.
When the injection molding machine closes the mold, the brake is clamped and the mold locking high pressure is reached, the injection molding machine starts injection molding, after a certain time delay, the mold plate of the injection molding machine starts to slightly open, namely the mold plate moves relatively to open the mold, and at the moment, the newly added proportional pressure valve and the stop valve are in an output state.
The mold plate of the injection molding machine is driven by pulling the pull rod, the pull rod is linked with the mold locking high-pressure proportional valve, when the pull rod is pulled, the mold locking high-pressure proportional valve starts to output, and when the pull rod is pulled down to the maximum extent, namely the mold plate moves to the maximum extent when being opened, the mold locking high-pressure proportional valve reaches the lowest valley of output, so that the mold plate is slightly opened.
When the pull rod reaches the maximum limit, the mold locking action is required to be carried out, namely, the newly added proportional pressure valve and the cut-off valve are closed, and after the mold is locked, the output of the mold locking high-pressure proportional valve reaches the highest peak to provide corresponding mold locking force.
And opening the mold and locking the mold in such a reciprocating way until the pressure maintaining is finished, performing the second injection pressure maintaining at the moment, and finally forming the product after the second injection pressure maintaining is finished.
The difference between this embodiment and the first embodiment is that the method further includes step S11, when the multi-stage mode-locking molding signal is received, the method proceeds to step S20, and if the multi-stage mode-locking molding signal is not received, the method performs the preset injection pressure maintaining to mold the product.
The injection molding machine can perform a general mold locking molding process and can perform multi-stage mold locking molding, a user can select the mold locking molding process according to the requirements of actual products, as shown in fig. 3, a function menu for starting multi-stage mold locking molding is arranged on the injection molding machine, the step S20 is entered when the function menu is selected, and if the function menu is not selected, the conventional mold locking molding process is performed, and the injection molding machine performs preset injection pressure maintaining to mold the products.
As shown in fig. 5, fig. 5 provides a mechanical structure diagram of mold locking and micro-opening, in which, number 1 indicates a mold locking mechanism, 2 indicates a movable mold, and 3 indicates a guide post, the mold locking mechanism 1 can push, and the mold locking mechanism 1 can provide a corresponding mold locking force to ensure that the mold can be sufficiently locked to match different injection pressures of the injection molding machine.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (3)
1. A multi-stage mold locking molding method of an injection molding machine is characterized by comprising the following steps:
s00: controlling the injection molding machine to carry out mold closing and brake holding;
s10: starting high pressure on an injection molding machine, starting the injection molding machine to perform injection molding on the mold when the injection molding pressure reaches a preset first pressure value, and presetting the first pressure value, namely the injection molding pressure value;
s20: the method comprises the following steps that the time that molten plastic can be preliminarily molded in a mold cavity is preset time, after the preset time is delayed, a mold plate of an injection molding machine is controlled to move to open the mold, the injection molding machine is adjusted to be in a preset first state, and the injection molding machine performs primary injection pressure maintaining through the preset first state;
s30: controlling a template of the injection molding machine to move so as to lock the mold, adjusting the injection molding machine to a preset second state, and continuously performing primary injection pressure maintaining on the injection molding machine through the preset second state;
the moving distance of the template is 1-5 mm;
s40: judging whether the first injection pressure maintaining of the injection molding machine is finished, if so, locking the mold, and performing the second injection pressure maintaining to mold the product, otherwise, turning to step S20, wherein the time length of the first injection pressure maintaining is set as the time required by completing four mold opening and mold locking, namely, the first injection pressure maintaining is completed after repeated mold opening and mold locking are required;
the step S10 is followed by the step of:
s11: when receiving the multi-stage mode locking molding signal, the process proceeds to step S20, and if the multi-stage mode locking molding signal is not received, preset injection pressure maintaining is performed to mold the product; the step S20 further includes the steps of:
s21: judging whether the template moves to a preset position or whether the moving time of the template reaches a preset moving time, if so, entering a step S30;
the injection molding machine further comprises a plunger pump, the preset first state comprises that the plunger pump is in a preset minimum flow state, and the preset second state comprises that the plunger pump is in a preset maximum flow state.
2. The method for multi-stage mold locking molding of an injection molding machine according to claim 1, wherein the injection molding machine further comprises a mold locking high-pressure proportional valve and a pull rod, the pull rod drives the mold plate of the injection molding machine to move by pulling, and the pull rod is linked with the mold locking high-pressure proportional valve.
3. The method of claim 1, wherein the mold clamping pressure of the injection molding machine during mold clamping is increased according to a predetermined pressure value each time mold clamping is performed.
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| CN201811295826.XA CN109605695B (en) | 2018-11-01 | 2018-11-01 | Multi-stage mold locking molding method for injection molding machine |
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| JP7349869B2 (en) * | 2019-10-02 | 2023-09-25 | ミネベアミツミ株式会社 | Pressure detection device and pass/fail judgment method |
| CN116353007B (en) * | 2023-03-02 | 2023-10-20 | 博创智能装备股份有限公司 | Intelligent pressure maintaining control method of hydraulic injection molding machine |
| CN116749464A (en) * | 2023-07-20 | 2023-09-15 | 佛山市宝塑精密机械有限公司 | Control method, device, equipment and medium for first band-type brake of injection molding machine |
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| JPH09290449A (en) * | 1996-04-25 | 1997-11-11 | Toshiba Mach Co Ltd | Molding die clamping device for injection molding |
| CN205173095U (en) * | 2015-11-12 | 2016-04-20 | 宁波顺兴机械制造有限公司 | Clapper die spotting press multistage control mode locking pressurize hydraulic control system |
| CN105946190A (en) * | 2016-05-23 | 2016-09-21 | 慈溪市盛艺模具有限公司 | Mold locking mechanism for injection molding machine |
| CN108068283A (en) * | 2016-11-11 | 2018-05-25 | 海天塑机集团有限公司 | The injection moulding method and equipment of secondary locked mode |
| CN207747364U (en) * | 2017-09-07 | 2018-08-21 | 海天塑机集团有限公司 | Multistage mode locking hydraulic control system and injection molding machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9067355B2 (en) * | 2013-05-14 | 2015-06-30 | Athena Automation Ltd. | Lock member for an injection molding machine |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09290449A (en) * | 1996-04-25 | 1997-11-11 | Toshiba Mach Co Ltd | Molding die clamping device for injection molding |
| CN205173095U (en) * | 2015-11-12 | 2016-04-20 | 宁波顺兴机械制造有限公司 | Clapper die spotting press multistage control mode locking pressurize hydraulic control system |
| CN105946190A (en) * | 2016-05-23 | 2016-09-21 | 慈溪市盛艺模具有限公司 | Mold locking mechanism for injection molding machine |
| CN108068283A (en) * | 2016-11-11 | 2018-05-25 | 海天塑机集团有限公司 | The injection moulding method and equipment of secondary locked mode |
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