CN113001921B - Method for setting optimal mold clamping force of toggle rod type mold clamping mechanism - Google Patents
Method for setting optimal mold clamping force of toggle rod type mold clamping mechanism Download PDFInfo
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- CN113001921B CN113001921B CN202110210744.6A CN202110210744A CN113001921B CN 113001921 B CN113001921 B CN 113001921B CN 202110210744 A CN202110210744 A CN 202110210744A CN 113001921 B CN113001921 B CN 113001921B
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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
- B29C45/7653—Measuring, controlling or regulating mould clamping forces
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention provides a method for setting the optimal mold clamping force of a toggle rod type mold clamping mechanism, wherein contact pressure sensors are respectively arranged at the sides of four pull rods on a mold parting surface, the change condition of the parting surface pressure in each mold testing process is recorded and read in a tester, the maximum mold expanding force in the mold filling process is kept unchanged because the mold clamping mechanism is in a dynamic balance process, and when the mold clamping force is changed, the parting surface pressure value has equal change quantity, so that the minimum value of the parting surface pressure can also change according to a linear relation when the mold clamping force set value of a test mold is reduced according to the linear relation. And (3) making a parting surface pressure-mode locking force diagram through an analysis solving device, fitting the data of each mode test, and solving the optimal mode locking force set value when the parting surface pressure is zero through a fitting straight line. The optimal mold clamping force setting method provided by the invention can be used for remarkably improving material overflow and resource waste caused by unreasonable mold clamping force setting, has the characteristics of high precision and stability, and is suitable for hydraulic or motor driving of a power source.
Description
Technical Field
The invention belongs to the relevant field of injection molding, and relates to a method for optimally setting a mold clamping force in an injection molding machine.
Background
The injection molding machine is the main production equipment of plastic products and mainly adopts the injection molding process for production. In the mold closing stage, the mold closing unit generates mold locking force, the mold deforms under compression, and the pull rod deforms under tension. The mold clamping force is one of important parameters in the injection molding process, and the reasonable setting of the mold clamping force of the injection molding machine is favorable for protecting a mold clamping unit and a mold, reducing the energy consumption and improving the product quality. If the set value of the mold locking force is too small, the parting surface expands at the maximum time of mold expansion, materials overflow, the product has the defects of flash and the like, the materials overflowing into the parting surface can damage the parting surface, and the service life of the mold is shortened; if the clamping force of the equipment is too large, the energy consumption in the injection molding process is increased, the exhaust effect of the mold is weakened, and the product can generate coking defects in severe cases.
The traditional mold clamping force setting method is set according to experience, and a mold clamping force setting value is approximately obtained by estimating the product of the projection area of a mold runner and a cavity on a parting surface of the mold runner and the cavity and a cavity pressure experience value. However, in actual production, in order to prevent the product from generating defects such as flash, the initial mold clamping force value is generally set to be larger, and the set mold clamping force cannot meet the requirements under various working conditions along with the change of actual working conditions such as molds, raw materials and process parameters, and the mode of setting the mold clamping force by simply relying on experience cannot meet the requirements of intelligent development of injection molding.
The existing research shows that the research on the breathing characteristic of the expansion die occurs, and G. PierWien provides a method for optimizing the die locking force by monitoring the deformation of the die: the method comprises the steps of considering that the mold is elastically deformed in the mold filling process, providing a rigidity coefficient of a mold closing unit, calculating the rigidity coefficient of the mold closing unit according to a plurality of groups of mold locking forces and mold deformation data obtained by mold testing, further solving the upper limit and the lower limit of mold expansion of the mold according to the rigidity coefficient of the mold closing unit, and continuously adjusting a set value of the mold locking force to test the mold again by judging that the maximum expansion modulus under the current mold locking force is lower than or higher than the upper limit and the lower limit of the mold expansion until the optimal set value of the mold locking force is determined (CN 104552850A). The existing mold locking force optimization method is low in applicability in actual production and complicated in solving.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for optimizing a set value of a mold clamping force of an injection molding machine, which is suitable for a toggle rod type mold clamping mechanism. The contact type pressure sensors are respectively arranged on the sides of four pull rods on the parting surface of the die, the change condition of the parting surface pressure in each die testing process is recorded and read in a tester, the die closing mechanism is in a dynamic balance process, the maximum die expanding force in the die filling process is kept unchanged, and when the die locking force is changed, the parting surface pressure value has equal change quantity, so that the minimum value of the parting surface pressure can be changed according to a linear relation when the die locking force set value of the die is reduced according to the linear relation. And (3) making a parting surface pressure-mode locking force diagram through an analysis solving device, fitting the data of each mode test, and solving the optimal mode locking force set value when the parting surface pressure is zero through a fitting straight line. The mold clamping force of the injection molding machine is optimized, material overflow and resource waste caused by unreasonable mold clamping force setting are obviously improved, and the injection molding machine has the advantages of being high in precision and stability.
In order to achieve the above object, according to the present invention, there is provided a method for optimizing a mold clamping force setting value of an injection molding machine based on a toggle clamping mechanism, that is, a method for setting an optimum mold clamping force of a toggle clamping mechanism, comprising the following steps (S1-S7 indicate steps 1 to 7, and seven steps in total):
s1: respectively installing a contact type pressure sensor on each side of four pull rods on the parting surface of the injection molding machine mold to measure the parting surface pressure value of each pull rod side, and checking the wiring and power supply conditions of the sensors;
s2: starting up and initializing equipment, and setting initial injection molding parameters according to preset adjusted experimental parameters, wherein the initial injection molding parameters comprise an initial rotating pressure point, initial pressure maintaining pressure, initial charging barrel temperature, injection rate and initial mold locking force, and the initial mold locking force is set as a rated value;
s3: entering a data acquisition stage, enabling the melt to enter a mold cavity at a constant injection rate, maintaining the pressure until the melt is cooled to obtain a qualified product, acquiring relevant parameters including mold parting surface pressure in the whole sampling period, and recording a parting surface pressure change curve along with mold filling time;
s4: sequentially reducing the set value of the mold locking force by 10 percent, performing mold testing for at least three times to obtain a qualified product as successful mold testing, collecting the pressure of a parting surface in the whole sampling period, recording the curve of the pressure of the parting surface changing along with time, and obtaining the minimum value of the pressure of the parting surface;
s5: entering a data analysis stage, and drawing a relation curve between the minimum value of the parting surface pressure and a set value of the mold locking force;
s6: solving a relation curve between the minimum parting surface pressure and a set value of the mold clamping force according to the optimal mold clamping force to obtain an optimal set value of the mold clamping force;
s7: and (4) completing the optimal solution, testing the mold, obtaining a qualified product as a successful mold test, and outputting a solution result of an optimal mold locking force set value.
Further, step S1 is preceded by step S0: and a group of injection molding process parameters with stable product quality are prepared in advance before mold testing.
Further, in step S5, in the curve of the pressure of the parting surface measured in the ith test mold over time, the minimum value P of the pressure of the parting surface in the mold filling process is obtained si (ii) a By setting the clamping force to a value P x On the horizontal axis, in terms of the minimum value of parting surface pressure P y Constructing a coordinate system for the longitudinal axis, marking the ith test mold in the coordinate system, and setting the mold locking force to be P i Minimum value of parting surface pressure is P si Corresponding point KP of i . Because the injection molding process parameters are fixed, the mold clamping mechanism is in a dynamic balance process, the maximum mold expanding force in the mold filling process is kept unchanged, when the mold clamping force is changed for mold testing, the parting surface pressure value has equal change, and when the mold clamping force set value of the test mold is reduced according to a linear relation, the minimum parting surface pressure value is also changed according to the linear relation. So the corresponding point KP of each mold filling i To a straight line P y ＝k·P x +b。
Further, when the mold clamping force setting is optimized in step S6, the mold parting plane pressure is zero at the maximum mold expansion time. Therefore, in the parting-surface pressure-clamping force diagram, the point KP is set i Straight line of fit P y ＝k·P x + b when P y When the straight line is 0, the horizontal axis P is fitted x The set value of the clamping force at the intersection point is optimized, and P is set y 0, optimum clamping force set value
Further, the straight line P is fitted in step S6 y ＝k·P x + b is slope
Generally speaking, the technical scheme of the invention is beneficial to realizing the accurate selection of the set value of the mold locking force, the method is set based on the toggle rod type mold closing mechanism, and is also suitable for the situation that the power source is driven by hydraulic pressure or a motor or is a pure hydraulic type mold closing mechanism.
Drawings
Further details of the invention will be apparent from the description of the figures. Wherein:
fig. 1 shows an optimization solving flow of a method for setting an optimal clamping force of a toggle clamping mechanism according to the present invention.
Fig. 2 is a configuration diagram of an optimization solving system of a method for setting an optimum clamping force of a toggle clamping mechanism according to the present invention.
Fig. 3 is a graph showing an optimization solution of a method for setting an optimum clamping force of the toggle clamping mechanism according to the present invention.
Detailed Description
The present invention will be described in further detail in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to effectively solve the problem of solving the optimal mold clamping force set value on the injection molding machine of the toggle rod type mold clamping mechanism, enable the injection molding machine to test the mold automatically according to a preset program and complete the optimal solution by the number of mold testing times as few as possible, the method for optimally solving the mold clamping force of the injection molding machine based on the toggle rod type mold clamping mechanism is provided, as shown in figure 1, and comprises the following steps:
s1: the parting surface of the injection molding machine mold was equipped with a contact pressure sensor on each side of the four tie bars, respectively, to measure the parting surface pressure value on each tie bar side, as shown in fig. 2, and the wiring and power supply conditions of the sensors were checked.
S2: the equipment is started and initialized, and initial injection molding parameters including an initial rotating point, initial pressure maintaining pressure and initial charging barrel temperature are set according to preset adjusted experimental parameters. The initial clamping force is set to a nominal value.
S3: and entering a data acquisition stage, enabling the melt to enter a mold cavity at a constant speed, maintaining the pressure until the melt is cooled, acquiring relevant parameters including the pressure of the parting surface of the mold in the whole sampling period, and recording a curve of the pressure of the parting surface along with the change of the mold filling time.
S4: and reducing the set value of the mold locking force by 10% in sequence, then performing at least mold testing, collecting the pressure of the parting surface in the whole sampling period, and recording the curve of the pressure of the parting surface along with the change of time.
S5: and entering a data analysis stage, and making a relation curve between the minimum value of the parting surface pressure and a set value of the mold locking force.
S6: and solving a relation curve between the minimum parting surface pressure and the set value of the mold locking force according to the optimal mold locking force to obtain the optimal set value of the mold locking force.
S7: and (4) the optimal solution is completed, the optimal clamping force set value is output for solution, and the controller completes the setting of the optimal clamping force.
Further, step S1 should be preceded by step S0: before the mold testing, a group of injection molding process parameters which enable the product quality to be relatively stable are prepared in advance.
Further, in step S5, in the curve of the pressure of the parting surface measured in the ith test mold over time, the minimum value P of the pressure of the parting surface in the mold filling process is obtained si . By setting the clamping force to a value P x On the horizontal axis, in the minimum value P of the parting surface pressure y Constructing a coordinate system for the longitudinal axis, marking the ith test mold in the coordinate system, and setting the mold locking force to be P i Minimum value of parting surface pressure is P si Corresponding point KP of i . Because the injection molding process parameters are fixed, the mold clamping mechanism is in a dynamic balance process, the maximum mold expanding force in the mold filling process is kept unchanged, when the mold clamping force is changed for mold testing, the parting surface pressure value has equal change, and when the mold clamping force set value of the test mold is reduced according to a linear relation, the minimum parting surface pressure value is also changed according to the linear relation. So that the corresponding point KP for each mold filling i To a straight line P y ＝k·P x +b。
Further, when the mold clamping force setting is optimal in step S6, the mold parting surface pressure is zero at the maximum mold expansion time. Thus in a parting-surface pressure-lock-die diagram, e.g.FIG. 3 shows for point KP i Straight line of fit P y ＝k·P x + b when P y Fitting a straight line to the horizontal axis P when equal to 0 x The set value of the clamping force at the intersection point is optimized, and P is set y 0, optimum clamping force set value
Further, the straight line P is fitted in step S6 y ＝k·P x + b is slope
Claims (5)
1. A method for setting the optimal mold clamping force of a toggle rod type mold clamping mechanism is characterized by comprising the following steps:
s1: a contact type pressure sensor is respectively arranged on each side of four pull rods on the parting surface of the injection molding machine mold so as to measure the parting surface pressure of each pull rod side, and the wiring and power supply conditions of the sensors are checked;
s2: starting up and initializing equipment, and setting initial injection molding parameters according to preset adjusted experimental parameters, wherein the initial injection molding parameters comprise an initial rotating pressure point, initial pressure maintaining pressure, initial charging barrel temperature, injection rate and initial mold locking force, and the initial mold locking force is set as a rated value;
s3: entering a data acquisition stage, enabling the melt to enter a mold cavity at a constant injection rate, maintaining the pressure until the melt is cooled to obtain a qualified product, acquiring relevant parameters including parting surface pressure in the whole sampling period, and recording a parting surface pressure change curve along with mold filling time;
s4: sequentially reducing the set value of the mold locking force by 10 percent, then testing the mold for at least three times to obtain a qualified product as a successful mold test, collecting the pressure of a parting surface in the whole sampling period, recording the curve of the pressure of the parting surface changing along with time, and obtaining the minimum value of the pressure of the parting surface;
s5: entering a data analysis stage, and making a relation curve between the minimum value of the parting surface pressure and a set value of the mold locking force;
s6: solving a relation curve between the minimum parting surface pressure and a set value of the mold clamping force according to the optimal mold clamping force to obtain an optimal set value of the mold clamping force;
s7: and (4) completing the optimal solution, testing the mold, obtaining a qualified product as a successful mold test, and outputting a solution result of an optimal mold locking force set value.
2. The method for setting an optimum clamping force of a toggle clamping mechanism according to claim 1, wherein: before step S1, a set of injection molding process parameters with stable product quality are prepared in advance before mold testing.
3. The method for setting an optimum clamping force of a toggle clamping mechanism according to claim 1, wherein: when the mold locking force setting is optimal in step S6, the parting surface pressure is zero at the maximum mold expansion time, and a straight line P fitted in the parting surface pressure-mold locking force diagram y ＝k·P x + b, optimal clamping force set value
4. The method for setting an optimum clamping force of a toggle clamping mechanism according to claim 1, wherein: the mould clamping mechanism is a toggle rod type mould clamping mechanism, and the power source is driven by hydraulic pressure or a motor.
5. The method for setting an optimum clamping force of a toggle clamping mechanism according to claim 4, wherein: the die clamping mechanism is a pure hydraulic die clamping mechanism.
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| JP5031867B2 (en) * | 2010-05-18 | 2012-09-26 | 東芝機械株式会社 | Injection molding method and apparatus |
| CN105835322A (en) * | 2016-01-25 | 2016-08-10 | 海天塑机集团有限公司 | Injection machine clamping force automatic calibration method |
| JP6137368B1 (en) * | 2016-03-24 | 2017-05-31 | 宇部興産機械株式会社 | Mold clamping control method of injection molding machine having toggle type mold clamping mechanism |
| CN108698296B (en) * | 2016-03-31 | 2020-12-11 | 住友重机械工业株式会社 | Information management device for injection molding and injection molding machine |
| CN109278265A (en) * | 2017-07-20 | 2019-01-29 | 富强鑫精密工业股份有限公司 | For the mode locking Force control system of molding machine, control method and monitoring compensation method |
| CN108621394B (en) * | 2018-04-02 | 2020-05-19 | 滁州晨润工贸有限公司 | Parameter monitoring method in injection molding process |
| AT521442B1 (en) * | 2018-07-12 | 2021-07-15 | Engel Austria Gmbh | Dynamic adjustment of the clamping force |
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