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CN113414955B - A kind of screw speed control method for improving plasticizing quality of injection molding machine - Google Patents

A kind of screw speed control method for improving plasticizing quality of injection molding machine Download PDF

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CN113414955B
CN113414955B CN202110873681.2A CN202110873681A CN113414955B CN 113414955 B CN113414955 B CN 113414955B CN 202110873681 A CN202110873681 A CN 202110873681A CN 113414955 B CN113414955 B CN 113414955B
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screw
injection molding
molding machine
screw speed
plasticizing
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CN113414955A (en
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谢鹏程
朱金柏
赵梓良
丁玉梅
杨卫民
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Beijing University of Chemical Technology
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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
    • 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
    • B29C2945/76494—Controlled parameter
    • B29C2945/76595—Velocity
    • B29C2945/76605—Velocity rotational movement
    • 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
    • B29C2945/76658—Injection unit
    • B29C2945/76665—Injection unit screw

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  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

本发明公开了一种提高注塑机塑化质量的螺杆转速控制方法，通过安装在螺杆末端的位移传感器采集螺杆当前位移值，并且注塑机控制器读取螺杆结构参数和初始工艺参数设定值，并将其代入螺杆转速控制函数计算模型，得到转速关于实时螺杆位移量的螺杆转速控制方案，并将其传输至注塑机塑化电机伺服控制系统对当前周期的螺杆转速进行实时控制，从而实现熔体塑化质量的均匀性。通过本发明一种提高注塑机塑化质量的螺杆转速控制的方法，有利于提高塑料熔体的塑化质量，改善熔体均匀性，减少因设备或材料更换造成的试模次数。

Figure 202110873681

The invention discloses a screw speed control method for improving the plasticizing quality of an injection molding machine. Substitute it into the screw speed control function calculation model to obtain the screw speed control scheme of the speed with respect to the real-time screw displacement, and transmit it to the servo control system of the plasticizing motor of the injection molding machine to control the screw speed of the current cycle in real time, so as to realize the melting process. Uniformity of body plasticization quality. The method for controlling the screw rotation speed for improving the plasticizing quality of the injection molding machine of the present invention is beneficial to improve the plasticizing quality of the plastic melt, improve the melt uniformity, and reduce the number of mold trials caused by equipment or material replacement.

Figure 202110873681

Description

一种提高注塑机塑化质量的螺杆转速控制方法A kind of screw speed control method for improving plasticizing quality of injection molding machine

技术领域technical field

本发明属于注塑成型领域，尤其涉及一种注塑机塑化过程螺杆转速值的设定方法。The invention belongs to the field of injection molding, and in particular relates to a method for setting a screw speed value in a plasticizing process of an injection molding machine.

背景技术Background technique

塑料具有重量轻、化学稳定性好等特点，广泛应用于各个领域，注射成型是塑料的主要加工方法之一。如今塑料制品的精密化对注射成型工艺提出了更高的要求，而塑化质量是确保注塑制品精度的先决条件。在塑化过程中，螺杆边旋转边轴向后退，螺杆的有效长度不断减小，造成不同时刻参与塑化的物料的热历程与剪切历程存在差异，导致计量室中熔体的均匀性下降。而螺杆的转速设置对熔体的温度、压力分布有直接影响，故有从业者通过在塑化过程中分段设置螺杆转速值的方法提高塑化质量，但传统的注塑工艺参数的确定方法主要是试错法，即依据相关人员有限的经验确定工艺参数后不断进行试模评定，最终确定合适的螺杆转速值。但在实际生产中，设备和材料的多样性造成具体产品的试模次数多，工艺参数确定时间长。因此，需要寻求一种螺杆转速的控制方法来克服以上困难，快速得出合适的螺杆转速设定值。Plastics have the characteristics of light weight and good chemical stability, and are widely used in various fields. Injection molding is one of the main processing methods of plastics. Nowadays, the precision of plastic products puts forward higher requirements on the injection molding process, and the quality of plasticization is a prerequisite to ensure the accuracy of injection molding products. During the plasticization process, the screw rotates and axially retreats, and the effective length of the screw decreases continuously, resulting in differences in the thermal history and shear history of the materials participating in plasticization at different times, resulting in a decrease in the uniformity of the melt in the metering chamber. . The screw speed setting has a direct impact on the temperature and pressure distribution of the melt. Therefore, some practitioners improve the plasticization quality by setting the screw speed value in sections during the plasticization process. However, the traditional method of determining the parameters of the injection molding process is mainly It is a trial and error method, that is, according to the limited experience of the relevant personnel, the process parameters are determined and the mold trial evaluation is carried out continuously, and the appropriate screw speed value is finally determined. However, in actual production, the diversity of equipment and materials results in a large number of mold trials for specific products and a long time to determine process parameters. Therefore, it is necessary to seek a control method of the screw speed to overcome the above difficulties and quickly obtain a suitable screw speed setting value.

发明内容SUMMARY OF THE INVENTION

本发明公开了一种提高注塑机塑化质量的螺杆转速控制方法，通过安装在螺杆末端的位移传感器采集螺杆当前位移值，并且注塑机控制器读取螺杆结构参数和初始工艺参数设定值，并将其代入螺杆转速控制函数计算模型，得到转速关于实时螺杆位移量的螺杆转速控制方案，并将其传输至注塑机塑化电机伺服控制系统对当前周期的螺杆转速进行实时控制，从而实现熔体塑化质量的均匀性。通过本发明一种提高注塑机塑化质量的螺杆转速控制的方法，有利于提高塑料熔体的塑化质量，改善熔体均匀性，减少因设备或材料更换造成的试模次数。The invention discloses a screw speed control method for improving the plasticization quality of an injection molding machine. Substitute it into the screw speed control function calculation model to obtain the screw speed control scheme of the speed with respect to the real-time screw displacement, and transmit it to the plasticizing motor servo control system of the injection molding machine to control the screw speed of the current cycle in real time, so as to realize the melting Uniformity of body plasticization quality. The method for controlling the screw rotation speed for improving the plasticizing quality of the injection molding machine of the present invention is beneficial to improve the plasticizing quality of the plastic melt, improve the melt uniformity, and reduce the number of mold trials caused by equipment or material replacement.

为了实现上述目的，本发明所采用的技术方案为：In order to achieve the above object, the technical scheme adopted in the present invention is:

本发明为一种提高注塑机塑化质量的螺杆转速控制方法，其设备构成主要包括注塑机塑化单元、螺杆位移传感器、传感器控制器、塑化伺服电机、伺服电机控制器、注塑机控制器等。The invention relates to a screw speed control method for improving the plasticizing quality of an injection molding machine. Wait.

一种提高注塑机塑化质量的螺杆转速控制方法，其特征在于包括以下S1-S4四个步骤：A screw speed control method for improving the plasticizing quality of an injection molding machine is characterized by comprising the following four steps S1-S4:

S1：注塑机开机并初始化，注塑机控制器读取设备信息文档，获取注塑机台及螺杆相关参数。S1: The injection molding machine is turned on and initialized, the injection molding machine controller reads the device information file, and obtains the relevant parameters of the injection molding machine and the screw.

S2：与螺杆相连接的位移传感器能够实时采集螺杆当前位置的数据，通过传感器控制电路放大及模数转换后，输入注塑机控制器。S2: The displacement sensor connected to the screw can collect the data of the current position of the screw in real time, and input it to the injection molding machine controller after amplification and analog-to-digital conversion by the sensor control circuit.

S3：用户按照预调一组可以使得制品质量稳定的注塑工艺参数，包括塑化行程、螺杆转速、螺杆背压、机筒温度、读取设备控制系统参数k、输入物料性能参数。读取设备控制系统参数k为螺杆转速可设置段数。S3: The user pre-adjusts a set of injection process parameters that can make the product quality stable, including plasticizing stroke, screw speed, screw back pressure, barrel temperature, reading equipment control system parameters k, and input material performance parameters. Read the equipment control system parameter k is the number of segments that can be set for the screw speed.

S4：在注塑机控制器内，将上述过程中所得各项参数代入螺杆转速控制函数计算模型，得到螺杆转速控制方程

Figure 530123DEST_PATH_IMAGE001
，即计算螺杆实时位置所需的螺杆转速值，并转化为控制信号，传递给塑化伺服电机，对螺杆转速进行实时控制。上述过程中所得各项参数代入计算的螺杆转速控制方程
Figure 591620DEST_PATH_IMAGE001
如下：S4: In the injection molding machine controller, the parameters obtained in the above process are substituted into the screw speed control function calculation model to obtain the screw speed control equation
Figure 530123DEST_PATH_IMAGE001
, that is, to calculate the screw speed value required for the real-time position of the screw, and convert it into a control signal, which is transmitted to the plasticizing servo motor to control the screw speed in real time. The parameters obtained in the above process are substituted into the calculated screw speed control equation
Figure 591620DEST_PATH_IMAGE001
as follows:

Figure 344812DEST_PATH_IMAGE002
Figure 344812DEST_PATH_IMAGE002

式中，记In the formula, record

Figure 757339DEST_PATH_IMAGE003
其中，
Figure 988600DEST_PATH_IMAGE004
为常数，仅与设备的结构参数以及用户设定的初始工艺参数相关，其值直接决定了熔体能耗值的大小，
Figure 170183DEST_PATH_IMAGE005
；
Figure 94276DEST_PATH_IMAGE006
为背压；
Figure 994099DEST_PATH_IMAGE007
为熔体表观粘度；
Figure 560210DEST_PATH_IMAGE008
为螺杆直径；
Figure 330720DEST_PATH_IMAGE009
为螺杆均化段深度；
Figure 691294DEST_PATH_IMAGE010
为螺杆均化段长度；
Figure 281675DEST_PATH_IMAGE011
为均化段螺旋升角；
Figure 651477DEST_PATH_IMAGE012
为材料热导率；
Figure 276493DEST_PATH_IMAGE013
为螺杆均化段对应机筒内壁温度；
Figure 73548DEST_PATH_IMAGE014
为均化段熔体温度；
Figure 682384DEST_PATH_IMAGE015
为初始螺杆转速；单位均为国际单位。
Figure 757339DEST_PATH_IMAGE003
in,
Figure 988600DEST_PATH_IMAGE004
is a constant, which is only related to the structural parameters of the equipment and the initial process parameters set by the user, and its value directly determines the energy consumption of the melt.
Figure 170183DEST_PATH_IMAGE005
;
Figure 94276DEST_PATH_IMAGE006
is back pressure;
Figure 994099DEST_PATH_IMAGE007
is the apparent viscosity of the melt;
Figure 560210DEST_PATH_IMAGE008
is the screw diameter;
Figure 330720DEST_PATH_IMAGE009
is the depth of the screw homogenization section;
Figure 691294DEST_PATH_IMAGE010
is the length of the homogenization section of the screw;
Figure 281675DEST_PATH_IMAGE011
is the helix angle of the homogenization section;
Figure 651477DEST_PATH_IMAGE012
is the thermal conductivity of the material;
Figure 276493DEST_PATH_IMAGE013
is the temperature of the inner wall of the barrel corresponding to the homogenization section of the screw;
Figure 73548DEST_PATH_IMAGE014
is the melt temperature in the homogenization section;
Figure 682384DEST_PATH_IMAGE015
is the initial screw speed; all units are SI units.

在注塑机控制器内计算出该塑化过程中的转速控制曲线。将所得的控制曲线进行采样和编码，然后输出到螺杆转速控制伺服电机的控制器，最后得到实时螺杆位置下最合适的螺杆转速，即螺杆塑化过程中，一边旋转一边沿轴向后退，不同时刻进入螺杆加料段的螺槽内塑料在熔融过程中，改变螺杆转速，使得其获得的能量保持一致，从而提高塑化质量的均匀性。The speed control curve in the plasticizing process is calculated in the injection molding machine controller. The obtained control curve is sampled and encoded, and then output to the controller of the screw speed control servo motor, and finally the most suitable screw speed under the real-time screw position is obtained. During the melting process of the plastic in the screw groove that enters the screw feeding section at all times, the screw speed is changed to keep the energy obtained by it consistent, thereby improving the uniformity of the plasticizing quality.

本发明提出一种提高注塑机塑化质量的螺杆转速控制方法，其优点在于：The present invention proposes a screw speed control method for improving the plasticizing quality of an injection molding machine, the advantages of which are:

（1）本发明为一种提高注塑机塑化质量的螺杆转速控制方法，该技术方案与现有技术相比，有利于提高注塑过程中塑料熔体的塑化质量，改善熔体塑化均匀性。(1) The present invention is a screw speed control method for improving the plasticizing quality of an injection molding machine. Compared with the prior art, this technical solution is beneficial to improve the plasticizing quality of the plastic melt during the injection molding process and improve the uniformity of melt plasticization. sex.

（2）大大减少了停机后再开机或更换模具而引起的试模次数，减少材料浪费。(2) The number of mold trials caused by restarting the machine or changing the mold after shutdown is greatly reduced, and material waste is reduced.

附图说明Description of drawings

图1是一种提高注塑机塑化质量的螺杆转速控制方法实施流程示意图；Fig. 1 is a kind of implementation flow schematic diagram of the screw rotational speed control method that improves the plasticizing quality of injection molding machine;

图2是一种提高注塑机塑化质量的螺杆转速控制装置结构原理图。Figure 2 is a structural schematic diagram of a screw speed control device for improving the plasticizing quality of an injection molding machine.

具体实施方式Detailed ways

以下通过具体实施方案，进一步说明本发明。下面描述仅仅是一部分实施例，任何基于本发明例的没有创造性的替换或修改，所获得的其他实施例都是属于本发明保护范围。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互结合。The present invention is further described below through specific embodiments. The following descriptions are only a part of the embodiments, and any non-creative replacement or modification based on the embodiments of the present invention, other obtained embodiments belong to the protection scope of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

本发明为一种提高注塑机塑化质量的螺杆转速控制方法，其设备构成主要包括注塑机塑化单元、螺杆位移传感器、传感器控制器、塑化伺服电机、伺服电机控制器、注塑机控制器等。The invention relates to a screw speed control method for improving the plasticizing quality of an injection molding machine. Wait.

一种提高注塑机塑化质量的螺杆转速控制方法，实施过程主要包括以下S1-S4四个步骤：A screw speed control method for improving the plasticizing quality of an injection molding machine, the implementation process mainly includes the following four steps S1-S4:

S1：注塑机开机并初始化，注塑机控制器读取设备信息文档，获取注塑机台及螺杆相关参数，螺杆直径为45mm，长径比为20，均化段槽深为2.7mm，均化段螺棱的螺旋升角为17°40′，S1: The injection molding machine is powered on and initialized, the injection molding machine controller reads the equipment information file, and obtains the relevant parameters of the injection molding machine and the screw. The helix angle of the flight is 17°40′,

S2：与螺杆相连接的位移传感器能够实时采集螺杆当前位置的数据

Figure 324718DEST_PATH_IMAGE016
，通过传感器控制电路放大及模数转换后，输入注塑机控制器。S2: The displacement sensor connected to the screw can collect the data of the current position of the screw in real time
Figure 324718DEST_PATH_IMAGE016
, after amplification and analog-to-digital conversion by the sensor control circuit, it is input to the injection molding machine controller.

S3：用户按照预调一组可以使得制品质量稳定的注塑工艺参数，包括塑化行程为5D=5x45=225mm、螺杆转速，初始螺杆转速为40rpm、螺杆背压为6MPa、机筒温度200℃、读取设备控制系统参数k=5、输入物料性能参数，200摄氏度时该PP料粘度为6x106PaS，k为螺杆转速可设置段数S3: The user pre-adjusts a set of injection process parameters that can make the product quality stable, including plasticizing stroke of 5D=5x45=225mm, screw speed, initial screw speed of 40rpm, screw back pressure of 6MPa, barrel temperature of 200℃, Read the equipment control system parameter k=5, input the material performance parameters, the viscosity of the PP material is 6x10 6 PaS at 200 degrees Celsius, k is the screw speed and the number of segments can be set

S4：在注塑机控制器内，将上述过程中所得各项参数代入螺杆转速控制函数计算模型，得到螺杆转速控制方程

Figure 335399DEST_PATH_IMAGE017
，即计算螺杆实时位置所需的螺杆转速值，即
Figure 270732DEST_PATH_IMAGE018
，利用上述参数，计算得到控制曲线近似方程：S4: In the injection molding machine controller, the parameters obtained in the above process are substituted into the screw speed control function calculation model to obtain the screw speed control equation
Figure 335399DEST_PATH_IMAGE017
, that is, the screw speed value required to calculate the real-time position of the screw, namely
Figure 270732DEST_PATH_IMAGE018
, using the above parameters, the approximate equation of the control curve is calculated:

Figure 366864DEST_PATH_IMAGE019
Figure 366864DEST_PATH_IMAGE019

其中：

Figure 547309DEST_PATH_IMAGE020
，
Figure 412497DEST_PATH_IMAGE021
为螺杆后退的距离，
Figure 754617DEST_PATH_IMAGE022
，
Figure 338045DEST_PATH_IMAGE023
为螺杆直径。in:
Figure 547309DEST_PATH_IMAGE020
,
Figure 412497DEST_PATH_IMAGE021
is the retreat distance of the screw,
Figure 754617DEST_PATH_IMAGE022
,
Figure 338045DEST_PATH_IMAGE023
is the screw diameter.

对上述关系式进行采样、量化、编码转化为控制信号，进一步传递给塑化伺服电机，对螺杆转速进行实时控制。上述过程中所得各项参数代入计算的螺杆转速控制方程

Figure 587760DEST_PATH_IMAGE024
的计算方式如下：The above relational expression is sampled, quantified, and encoded into a control signal, which is further transmitted to the plasticizing servo motor to control the screw speed in real time. The parameters obtained in the above process are substituted into the calculated screw speed control equation
Figure 587760DEST_PATH_IMAGE024
is calculated as follows:

Figure 307455DEST_PATH_IMAGE025
Figure 307455DEST_PATH_IMAGE025

式中，记In the formula, record

Figure 617213DEST_PATH_IMAGE026
Figure 617213DEST_PATH_IMAGE026

Figure 156779DEST_PATH_IMAGE027
其中，
Figure 210186DEST_PATH_IMAGE028
仅与设备的结构参数以及用户设定的初始工艺参数相关，其值直接决定了熔体能耗值的大小，
Figure 253228DEST_PATH_IMAGE029
；
Figure 733888DEST_PATH_IMAGE030
为背压；
Figure 26329DEST_PATH_IMAGE031
为熔体表观粘度；
Figure 617847DEST_PATH_IMAGE032
为螺杆直径；
Figure 312134DEST_PATH_IMAGE033
为螺杆均化段深度；
Figure 432537DEST_PATH_IMAGE034
为螺杆均化段长度；
Figure 477853DEST_PATH_IMAGE035
为均化段螺旋升角；
Figure 840439DEST_PATH_IMAGE036
为材料热导率；
Figure 858074DEST_PATH_IMAGE037
为螺杆均化段对应机筒内壁温度；
Figure 946115DEST_PATH_IMAGE038
为均化段熔体温度；
Figure 416411DEST_PATH_IMAGE039
为初始螺杆转速；单位均为国际单位。
Figure 156779DEST_PATH_IMAGE027
in,
Figure 210186DEST_PATH_IMAGE028
It is only related to the structural parameters of the equipment and the initial process parameters set by the user, and its value directly determines the size of the melt energy consumption.
Figure 253228DEST_PATH_IMAGE029
;
Figure 733888DEST_PATH_IMAGE030
is back pressure;
Figure 26329DEST_PATH_IMAGE031
is the apparent viscosity of the melt;
Figure 617847DEST_PATH_IMAGE032
is the screw diameter;
Figure 312134DEST_PATH_IMAGE033
is the depth of the screw homogenization section;
Figure 432537DEST_PATH_IMAGE034
is the length of the homogenization section of the screw;
Figure 477853DEST_PATH_IMAGE035
is the helix angle of the homogenization section;
Figure 840439DEST_PATH_IMAGE036
is the thermal conductivity of the material;
Figure 858074DEST_PATH_IMAGE037
is the temperature of the inner wall of the barrel corresponding to the homogenization section of the screw;
Figure 946115DEST_PATH_IMAGE038
is the melt temperature in the homogenization section;
Figure 416411DEST_PATH_IMAGE039
is the initial screw speed; all units are SI units.

在注塑机控制器内计算出该塑化过程中的转速控制曲线。将所得的控制曲线进行采样、编码，然后输出到螺杆转速控制伺服电机的控制器，最后得到实时螺杆位置下，最合适的螺杆转速。即在塑化过程中，螺杆一边旋转一边沿轴向后退，使不同时刻进入螺杆加料段的塑料在熔融过程中获得的能量保持一致，从而提高塑化质量的均匀性，通过实验验证，在注塑过程中，与恒定螺杆转速相比实时改变螺杆转速，制品的质量重复精度方差由42.90降低到29.48，样品性能方面，冲击强度提升约10.8%。The speed control curve in the plasticizing process is calculated in the injection molding machine controller. The obtained control curve is sampled and encoded, and then output to the controller of the screw speed control servo motor, and finally the most suitable screw speed under the real-time screw position is obtained. That is, during the plasticizing process, the screw rotates and retreats in the axial direction, so that the energy obtained by the plastic entering the screw feeding section at different times during the melting process is consistent, thereby improving the uniformity of plasticizing quality. During the process, the screw speed was changed in real time compared with the constant screw speed, and the variance of the quality repeatability of the product was reduced from 42.90 to 29.48. In terms of sample performance, the impact strength was increased by about 10.8%.

Claims (1)

1.一种提高注塑机塑化质量的螺杆转速控制的方法，设备构成主要包括注塑机塑化单元、螺杆位移传感器、传感器控制器、塑化伺服电机、伺服电机控制器和注塑机控制器，其特征在于，包括以下S1-S4四个步骤：1. A method for controlling the rotational speed of a screw for improving the plasticizing quality of an injection molding machine, the equipment composition mainly includes a plasticizing unit of the injection molding machine, a screw displacement sensor, a sensor controller, a plasticizing servo motor, a servo motor controller and an injection molding machine controller, It is characterized in that, including the following four steps S1-S4: S1：注塑机开机并初始化，注塑机控制器读取设备信息文档，获取注塑机台及螺杆相关参数；S1: The injection molding machine is turned on and initialized, the injection molding machine controller reads the equipment information file, and obtains the relevant parameters of the injection molding machine and screw; S2：与螺杆相连接的位移传感器能够实时采集螺杆当前位置的数据，通过传感器控制电路放大及模数转换后，输入注塑机控制器；S2: The displacement sensor connected to the screw can collect the data of the current position of the screw in real time, and input it to the injection molding machine controller after amplification and analog-to-digital conversion by the sensor control circuit; S3：用户按照预调一组可以使得制品质量稳定的注塑工艺参数，包括塑化行程、螺杆转速、螺杆背压、机筒温度、读取设备控制系统参数k、输入物料性能参数；读取设备控制系统参数k时螺杆转速可设置段数；S3: The user pre-adjusts a set of injection process parameters that can make the product quality stable, including plasticizing stroke, screw speed, screw back pressure, barrel temperature, reading equipment control system parameters k, input material performance parameters; reading equipment When controlling the system parameter k, the number of segments of the screw speed can be set; S4：在注塑机控制器内，将上述过程中所得各项参数代入螺杆转速控制函数计算模型，得到螺杆转速控制方程
Figure 550309DEST_PATH_IMAGE001
，即计算螺杆实时位置所需的螺杆转速值，并转化为控制信号，传递给塑化伺服电机，对螺杆转速进行实时控制；通过以下公式得到螺杆实时位置
Figure 953608DEST_PATH_IMAGE002
处，所需最佳螺杆转速值
Figure 681393DEST_PATH_IMAGE001
：S4: In the injection molding machine controller, the parameters obtained in the above process are substituted into the screw speed control function calculation model to obtain the screw speed control equation
Figure 550309DEST_PATH_IMAGE001
, that is, the screw speed value required to calculate the real-time position of the screw, and convert it into a control signal, which is transmitted to the plasticizing servo motor to control the screw speed in real time; the real-time position of the screw is obtained by the following formula
Figure 953608DEST_PATH_IMAGE002
, the required optimum screw speed value
Figure 681393DEST_PATH_IMAGE001
:
Figure 435722DEST_PATH_IMAGE003
Figure 435722DEST_PATH_IMAGE003
 式中，记In the formula, record
Figure 641576DEST_PATH_IMAGE004
Figure 641576DEST_PATH_IMAGE004
Figure 164961DEST_PATH_IMAGE005
Figure 164961DEST_PATH_IMAGE005
 其中，
Figure 594805DEST_PATH_IMAGE006
为常数，仅与设备的结构参数以及用户设定的初始工艺参数相关，其值直接决定了熔体能耗值的大小，
Figure 538228DEST_PATH_IMAGE007
；
Figure 78931DEST_PATH_IMAGE008
为背压；
Figure 191243DEST_PATH_IMAGE009
为熔体表观粘度；
Figure 526410DEST_PATH_IMAGE010
为螺杆直径；
Figure 724173DEST_PATH_IMAGE011
为螺杆均化段深度；
Figure 802987DEST_PATH_IMAGE012
为螺杆均化段长度；
Figure 769806DEST_PATH_IMAGE013
为均化段螺旋升角；
Figure 275874DEST_PATH_IMAGE015
为材料热导率；
Figure 492092DEST_PATH_IMAGE016
为螺杆均化段对应机筒内壁温度；
Figure 843439DEST_PATH_IMAGE017
为均化段熔体温度，
Figure 195923DEST_PATH_IMAGE018
为初始螺杆转速；单位均为国际单位。in,
Figure 594805DEST_PATH_IMAGE006
is a constant, which is only related to the structural parameters of the equipment and the initial process parameters set by the user, and its value directly determines the energy consumption of the melt.
Figure 538228DEST_PATH_IMAGE007
;
Figure 78931DEST_PATH_IMAGE008
is back pressure;
Figure 191243DEST_PATH_IMAGE009
is the apparent viscosity of the melt;
Figure 526410DEST_PATH_IMAGE010
is the screw diameter;
Figure 724173DEST_PATH_IMAGE011
is the depth of the screw homogenization section;
Figure 802987DEST_PATH_IMAGE012
is the length of the homogenization section of the screw;
Figure 769806DEST_PATH_IMAGE013
is the helix angle of the homogenization section;
Figure 275874DEST_PATH_IMAGE015
is the thermal conductivity of the material;
Figure 492092DEST_PATH_IMAGE016
is the temperature of the inner wall of the barrel corresponding to the homogenization section of the screw;
Figure 843439DEST_PATH_IMAGE017
is the melt temperature in the homogenization section,
Figure 195923DEST_PATH_IMAGE018
is the initial screw speed; all units are SI units.
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