TWI404620B - An injection molding machine - Google Patents

Abstract

Provided is a display device for an injection molding apparatus, which melts a resin both with a melting heat generated by the rotation of a screw (13) and by a heater mounted in a cylinder (11). The display device is characterized in that the energy quantity of the neighborhood of the inner wall of the cylinder (11), that is, at least one of a temperature, a heat flow speed and a heat flow rate is calculated on the basis of the detected temperature values of temperature detectors (A-1 to E-2) arranged along the axial direction of the cylinder (11) and is displayed to correspond to the axial position of the cylinder (11). The energy quantity is displayed by continuous lines indicating the numerical values, arrows, bar graphs and numerical values. Alternatively, the energy quantity is displayed by a plurality of lines.

Description

Injection molding machine display device

The present invention relates to a display device for an injection molding machine, and more particularly to a display device for an injection molding machine that melts and ejects a resin in a cylinder.

In the injection molding, in order to maintain the quality of the resin molded article, it is extremely important to monitor and manage the molten state of the resin in the cylinder of the injection device. Although the molten state of the resin in the cylinder can be grasped by the temperature of the resin, since the temperature of the resin cannot be directly measured, the temperature of the resin is estimated by calculating the energy imparted to the resin in the cylinder. The proposal was presented. The calculation of the energy imparted to the resin in the cylinder is based on the temperature of the cylinder wall and the torque of the screw.

In order to grasp the state of the resin in the cylinder, a proposal is made to display a temperature profile corresponding to the set temperature of the cylinder in a line graph, and a temperature profile in the direction of the cylinder axis by the heat transfer analysis method is proposed ( For example, please refer to Patent Document 1).

Further, the following proposal is proposed: when the display set by the control device of the injection molding machine displays the measured temperature, in addition to displaying the measured temperature by the numerical value, the numerical value can be simultaneously displayed by corresponding to the temperature control. In the case of the type of the active mode, the color is displayed in a different color (for example, refer to Patent Document 2).

Further, the following proposal is also proposed: finding the snail in the cylinder The resin temperature profile in the rod groove and the resin temperature distribution in the screw axis direction are displayed in a pattern (for example, refer to Patent Document 3).

[Patent Document 1] JP-A-2002-172666 [Patent Document 3] JP-A-6-31795

The display mode of the display device of the conventional injection molding machine is a graph showing the temperature profile of the cylinder obtained in advance, and can only simply display the measured temperature of the finite measurement point in the cylinder, and cannot display the cylinder located in the cylinder. The temperature of the energy at each position in the axial direction, the heat flux and the heat. That is, in the conventional display mode, before the actual temperature of the cylinder and the internal resin temperature (the molten state of the resin) have a certain correspondence relationship, the temperature of the cylinder is used only to estimate the inside of the cylinder. Resin state.

However, in reality, there is no corresponding relationship between the temperature of the cylinder and the temperature of the internal resin (melted state of the resin), but it changes due to the thermal energy conduction direction in the cylinder wall and the temperature distribution in the cylinder axis direction. Therefore, only the temperature and temperature curves of the cylinder are used for display, and the state of the resin in the cylinder cannot be accurately grasped. Further, the relationship between the temperature of the cylindrical wall and the temperature of the internal resin is related to the energy passing through the cylindrical wall, and the internal resin temperature cannot be accurately grasped only by the temperature of the cylinder. Furthermore, by changing the temperature setting of a part of the cylinder, it is impossible to predict what effect the temperature of other parts of the cylinder will be affected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a display device for an injection molding machine which can easily and accurately grasp the state of a resin in a cylinder.

In order to achieve the above object, a first object of the present invention is to provide a display device for an injection molding machine in which a resin in a cylinder is kneaded while rotating a screw to generate heat of fusion while being used. The heater on the cylinder is configured to supply thermal energy to the resin in the cylinder, wherein the circle is calculated based on a temperature detection value obtained by using a temperature detector disposed along an axial direction of the cylinder The energy near the inner wall of the cylinder is displayed corresponding to the axial position of the cylinder.

In the display device of the above injection molding machine, it is preferable that the energy is displayed as a continuous line indicating a value located at a position along the axial direction of the cylinder. The continuous line may be displayed in a plurality of bars corresponding to different timings or different positions in the diameter direction of the cylinder. Further, the display device of the injection molding machine can also be used to display the temperature distribution of the cylindrical cross section.

Further, in the display device of the injection molding machine, the energy may be displayed by an arrow indicating a value at a position along the axial direction of the cylinder. Alternatively, the energy may be displayed by a bar graph indicating the value of the position along the axial direction of the cylinder. Further, the energy may be displayed in a numerical value at a position along the axial direction of the cylinder.

Further, in the display device of the injection molding machine, the energy is preferably at least one of a temperature, a heat flux, and a heat flow rate. The above energy can also The estimated value is estimated based on the operation command value of the heater and the temperature detection value obtained by the temperature detector. Alternatively, the energy may be an estimated value calculated based on an analog value calculated by a predetermined temperature setting condition and a molding condition.

Further, in the display device of the injection molding machine, it is preferable to simultaneously display a temperature setting value at a plurality of positions along the axial direction of the cylinder and a graph indicating energy in the vicinity of the inner wall of the cylinder. Alternatively, a temperature setting value at a plurality of positions along the axial direction of the cylinder and a graph indicating energy in the vicinity of the inner wall of the cylinder at the plural position may be simultaneously displayed; The position corresponds to the above complex position of the cylinder. Further, a cooling cylinder may be provided on the rear end side of the cylinder, and a temperature detection value at a predetermined position of the cooling cylinder and a graph indicating energy near the inner wall of the cylinder may be simultaneously displayed. .

Moreover, in the display device of the injection molding machine of the present invention, the injection molding machine may be a Puripura type injection molding machine having a plunger for emitting molten resin in the cylinder. The cylinder may also be a cylinder containing the above screw. Further, the cylinder may be a cylinder including the plunger.

Further, in order to achieve the above object, another object of the present invention is to provide a display device for an injection molding machine which is configured to be used in a circle while kneading a resin while rotating a resin while generating heat of fusion. a heater on the barrel for supplying thermal energy to the resin in the cylinder, wherein: detecting the temperature according to the direction along the axis of the cylinder The energy of the cylinder calculated by the temperature detection value obtained by the device is displayed in a plurality of lines corresponding to the axial direction position of the cylinder.

In the display device of the injection molding machine, at least one of the plurality of continuous lines is preferably used to indicate the energy in the vicinity of the inner wall of the cylinder. Further, the energy may be a temperature or a heat flux. Further, the energy may be an estimated value estimated based on an operation command value of the heater, the temperature detection value obtained by the temperature detector, and a heat flow rate. Further, the energy may be an estimated value calculated based on an analog value calculated by a predetermined temperature setting condition and a molding condition. Further, the temperature distribution of the cross section of the cylinder may be displayed. Furthermore, the injection molding machine may be a Puripura type injection molding machine having a plunger for emitting molten resin in the cylinder. The cylinder may also be a cylinder containing the above screw.

Further, another object of the present invention is to provide a display device for an injection molding machine that supplies heat by a heater provided on a cylinder while kneading a resin while kneading a resin by rotating a screw. The resin is formed in the cylinder, wherein the energy of the cylinder is calculated based on a temperature detection value obtained by using a temperature detector disposed along an axial direction of the cylinder to correspond to the above A plurality of lines of the axial direction of the cylinder are displayed.

According to the present invention, the state of the resin in the cylinder can be easily grasped by the display content of the display device. Thereby, the target set temperature of each part of the cylinder can be easily set in accordance with the state of the resin in the cylinder. also, In order to make the state of the resin in the cylinder into a desired state, it can be easily judged how the temperature setting of the cylinder should be set.

First, the injection device and the heating cylinder which can be applied to the injection molding machine of the present invention will be described with reference to Figs. 1 to 3 . FIG. 1 is a cross-sectional view of the injection device 10.

The injection device 10 includes a heating cylinder (which may also be simply referred to as a cylinder) 11 and a screw 13 that is rotatable and movable forward and backward in the heating cylinder 11. At the front end of the heating cylinder 11, an injection nozzle 105 in which a nozzle port 106 is formed is provided. The cooling cylinder 14 is connected to the rear end of the heating cylinder 11, and the screw 13 extends through the cooling cylinder 14 to extend into the cylinder 11. In the wall of the cooling cylinder 14, a cooling pipe 14a for allowing cooling water to flow is formed. At a predetermined position of the cooling cylinder 14, a resin supply port 112 is formed. The resin supply port 112 is connected to the hopper 12 by the splicing cylinder 113, and the resin pellet 115 in the hopper 12 is supplied into the cylinder 11 through the splicing cylinder 113 and the resin supply port 112. Further, on the periphery of the cylinder 11, band-shaped band heaters h1, h2, h3 are attached. By energizing the band heaters h1, h2, h3, the resin chips 115 located in the cylinder 11 can be heated and melted.

The screw 13 includes a flight portion 102, a screw head 107 provided at the front end of the blade portion 102, and a seal portion 108. The squeegee portion 102 is provided on the periphery of the body of the screw 13 A squeegee 103 formed in a spiral shape is formed, and a spiral groove 104 is formed by the squeegee 103. Further, in the squeegee portion 102, in order from the rear to the front, a transport zone (S1) for transporting the resin chips 115 dropped from the hopper 12 to the front is sequentially formed; and the supplied resin chips are supplied. 115 a compression region S2 that is melted while being compressed, and a measurement region S3 that quantitatively measures the resin that has been melted. Further, the division of the region of the heating cylinder 11 is not limited to three regions such as the conveyance region S1, the compression region S2, and the measurement region S3, and may be divided into three or more regions, and the band heaters are independently provided in the respective regions.

At the time of the measurement step, when the screw 13 is rotated in the forward direction, the resin chips 115 are supplied from the resin supply port 112 to the transport region S1, and proceed to the inside of the groove 104 (to the left in the drawing). Next, the screw 13 is moved backward (to the right in the drawing), and the resin is accumulated in front of the screw head 107. Further, the resin in the groove 104 is located in the transport region S1 as it is, and the person located in the compressed region S2 is in a semi-molten state, and in the metering region S3, it is completely melted into a liquid state. Therefore, at the time of the ejection step, the screw 13 advances, and the liquid resin accumulated in front of the screw head 107 is ejected from the injection nozzle 105, and is filled in the cavity space of the fixed mold of the mold device.

Fig. 2 is a view showing the configuration of a temperature control device for controlling the temperature of the heating cylinder 11. As shown in Fig. 2, the heating cylinder 11 and the injection nozzle 105 are divided into four regions along the long axis direction extending from the cooling cylinder 14 to the injection nozzle 105. Here, corresponding to the heater provided, the four regions are sequentially called in the order of the region adjacent to the cooling cylinder 14. It is the first region 21, the second region 22, the third region 23, and the fourth region 24. Therefore, the nozzle 105 is formed in the fourth region 24. Further, the cooling cylinder 14 is used to cool the funnel 12 and the cylinder provided in the vicinity thereof by flowing cooling water into the cooling water pipe 14a, and can be used to maintain the circumference of the funnel 12 below a certain temperature. Further, a thermocouple 14b for detecting the temperature is embedded in the cooling cylinder 14.

In the first to third regions 21 to 23, as shown in Fig. 1, the band heaters h1, h2, and h3 that are individually energized are disposed on the outer periphery of the heating cylinder 11. Further, although not shown here, a heater is also provided around the nozzle 105 to heat the nozzle 105. This heater is called heater h4. Further, in the example shown in Fig. 2, the temperature sensors A-1 and A-2 in which one set of temperature sensors are arranged along the diameter direction in the first region 21 are similarly formed in the second region 22 in the same manner. The temperature sensors B-1 and B-2 are arranged with one set of temperature sensors, and the temperature sensors C-1 and C-2 of one set of temperature sensors are also arranged in the third area 23. Further, in the fourth region 24, temperature sensors D-1 and D-2 and E-1 and E-2 of two sets of temperature sensors are disposed. Further, among the pair of temperature sensors provided in each area, at least one of the temperature sensors A-2 to E-2 which are close to the outer wall of the cylinder 11 may be provided. Further, a temperature sensor X-1 (corresponding to 14b of Fig. 1) for detecting the temperature of the cooling cylinder may be provided in the cooling cylinder 14.

Since the temperature sensors of the respective groups have the same position with respect to the heating cylinder 11 and the injection nozzle 105, the temperature sensors A-1 and A-2 shown in Fig. 3 will be described as an example. The temperature sensor A-1 is embedded in the heat to reach the temperature in the vicinity of the inner wall of the heating cylinder 11 The depth of the hole near the inner wall of the cylinder 11 is in the hole. The temperature sensor A-2 is buried in the position closer to the heater h1 than the temperature sensor A-1. The temperature sensors A-1 and A-2 are located on the same cross section of the heating cylinder 11, and are disposed at different positions along the radial direction. In the example shown in Fig. 3(a), the temperature sensor A-1 And the A-2 is located on the opposite side of the radial direction, that is, at a position separated by 180 degrees.

As shown in Fig. 3(b), the temperature sensors A-1 and A-2 may be disposed at positions shifted in the axial direction in the same heater region at the same position in the circumferential direction. In this case, the temperature sensor A-1 near the inner wall and the temperature sensor A-2 which detects the temperature outside the inner wall are provided in the respective arrangement holes. As a result, since a temperature sensor can be disposed in each of the arrangement holes, assembly and maintenance of the temperature sensor becomes easy.

Further, as shown in Fig. 3(c), the temperature sensors A-1 and A-2 may be disposed at the same position along the axial direction at the same position in the circumferential direction. In this case, the temperature sensor A-1 near the inner wall and the temperature sensor A-2 detecting the temperature outside the inner wall are provided in the same arrangement hole. As a result, the amount of thermal energy movement in the radial direction can be accurately detected, and the heat flux near the inner wall can be accurately grasped.

As described above, in the present embodiment, a plurality of temperature sensors are disposed in the same heater region along the long axis direction of the injection nozzle 105 and the heating cylinder 11, or at different depths of the same section. A plurality of temperature sensors are provided.

As shown in Figure 2, the temperature sensors of each group (for example, A-1, A-2) It is connected to a controller 130. The controller 130 includes a temperature control unit 301 that receives an input signal from each temperature sensor, calculates the value based on the detected value, and outputs the calculation result as an operation amount in the form of a PWM signal or an analog signal. The on/off switchers 302-1 to 302-4 are turned on/off based on the operation amount; and the first to fourth regions 21 are provided by the switches 302-1 to 302-4. ~24 set heaters h1, h2, h3, h4 power supply 303.

The temperature control unit 301 is configured to input a temperature set value while displaying the detected value from the temperature sensor, and is connected to a display input device (also simply referred to as a display device) 135 for the temperature control unit 301. The display input device 135 is preferably a display device and can display a display setting screen as shown. In the display setting screen as shown in the figure, the detection value from the temperature sensor in each area, that is, the temperature detection value display unit 351 for displaying the temperature detection value in each area, and each area can be displayed. The temperature setting unit 352 and the like whose temperature is set as the set value.

In the display setting screen, all the detected temperatures of the temperature sensors can be displayed; further, the display device 135 further includes a switch for setting the temperature control from the nozzles 105 and the respective regions of the heating cylinder 11 to Among the plurality of temperature sensors in the same area, which temperature sensor is selected for control.

On the other hand, the temperature control unit 301 performs control calculation based on the difference between the detected temperature of the temperature sensor selected by the display device 135 and the set temperature, and outputs the calculation result as an operation amount to the heating corresponding to each region. The switches 302-1 to 302-4 are provided. That is, from Wen The operation amount of the degree control unit 301 is a signal for determining an on period of the switches 302-1 to 302-4 for controlling the time at which the switches 302-1 to 302-4 are in an on state. Proportional action (on duty). As a result, the energization time in each zone can be controlled, and the temperature at which the nozzle 105 and the temperature sensor selected by the heating cylinder 11 are disposed can be maintained at the set temperature.

By using the temperature sensors A-1 to E-2, the controller 130, and the display input device 135 as shown in FIG. 2, a display device as described later can be formed to display the respective portions of the heating cylinder 11. The heat flux or heat flow rate and the state of the resin in the heating cylinder 11 is shown.

In addition, the above-mentioned injection molding machine is a so-called "screw type injection molding machine" in which the resin is melted, measured, and emitted by a screw of an injection member in a cylinder. However, the present invention is not limited thereto, and the resin is not limited thereto. For the melting, a so-called "Puripura type injection molding machine" that emits by a plunger of an injection member and is metered by a screw of a measuring member can be used. The Puripura type injection molding machine is a widely used molding machine, and as shown in Fig. 17, it has an injection device 200 in which a resin measuring unit 202 and a resin injection unit 204 are separately provided.

In the resin measuring unit 202, the screw 208 of the measuring member is rotated in the screw cylinder 206, and the resin is kneaded and melted while applying heat energy from the heater 210. The resin melted in the screw cylinder 206 is measured by the rotation of the screw 208 and sent to the resin injection portion 204.

In the resin injection portion 204, the molten resin is supplied to the plunger circle Cartridge 212. In the plunger cylinder 212, the plunger 214 of the injection member is contained in the cylinder. The plunger 214 is reciprocated in the plunger cylinder 212 by being driven by the plunger driving unit 216, and the molten resin supplied to the front side thereof is emitted toward the mold. Further, a heater 218 may be provided in the plunger cylinder 212 to heat the molten resin supplied to the plunger cylinder 212 and maintain the molten state until it is emitted.

Next, a display example of a display device of an injection molding machine according to an embodiment of the present invention will be described. The following description will be made with respect to a display example for grasping the state of the resin in the cylinder 11 of the injection molding machine, and the display is performed using the display device 135. Further, the cylinder 11 can be divided into four regions of the regions Z1 to Z4, and the nozzle portion at the front end of the cylinder 11 can be divided into two regions of the regions Z15a and Z15b, and temperature sensors are provided in the respective regions.

Here, the display device 135 does not have to be a setting operation screen of the injection molding machine, and may be a general PC additionally provided in the injection molding machine. Further, it may be a centralized management device for managing the operating state of the plurality of injection molding machines.

Fig. 4 is a view showing a display screen 30 for displaying the temperature of the inner wall of the cylinder 11 along the axial direction of the cylinder 11. On the upper portion of the display screen 30 as shown in Fig. 4, a graph 31 showing the temperature of the inner wall of the cylinder 11 is displayed. In the graph 31, the horizontal axis indicates the position along the axis of the cylinder 11, and the nozzle portion from the rear end to the front end of the cylinder 11 is shown. The vertical axis of the graph 31 indicates the inner wall temperature calculated by the estimation method described later. In the horizontal axis of the graph 31, the left side is the nozzle side of the cylinder, and the right side is the cooling cylinder 14 side. Here, the inner wall temperature indicates the temperature in the vicinity of the portion of the inner wall of the cylinder 11 which is in contact with the resin (the temperature of the position of the temperature sensor A-1 as shown in Fig. 3). In the graph 31, although the inner wall temperature is continuous along the axial direction of the cylinder 11, the actual temperature detection value is only the detection value obtained by the temperature sensors A-1 to E-2, and The inner wall temperature at a position other than the position is an estimated value obtained by interpolation.

Further, each of the vertical lines shown in the graph 31 is shown in the position of the temperature sensor in the regions Z1 to Z15b as shown below. For example, the vertical line located immediately above Z1 indicates the position of the temperature sensor A-1 disposed in the zone Z1 along the cylinder axis direction.

In Fig. 4, the temperature of the middle portion of the inner and outer walls of the cylinder 11 (the position of the sensor A-2 shown in Fig. 3) below the graph 31 indicating the inner wall temperature is determined by each region. Displayed in the bar chart field 32~37. In each of the bar graph fields 32 to 37, a bar graph can also be used to indicate the temperature value. Further, under the respective bar graph fields 32 to 37, the numerical value of the intermediate portion of the inner and outer walls of the display cylinder 11 is displayed in the field of the fields 38 to 43, and the inner and outer walls of the cylinder 11 are in the middle. Some of the temperature settings are displayed in various areas.

Alternatively, a temperature sensor may be provided near the outer wall to display the detected value at that location. In this case, the temperature of the heater near the outer wall can be grasped. Since the temperature near the outer wall can be quickly reacted to the heater, the controllability of the heater can be improved.

In the zone Z1, the temperature of the middle portion of the inner and outer walls is set to 170 ° C (set value 170 ° C), and the temperature of the middle portion of the actual inner and outer walls is 170 ° C as shown by the bar graph and the numerical value. Further, in the zone Z2, the temperature of the intermediate portion between the inner and outer walls is set to 190 ° C (set value 190 ° C), and the temperature of the middle portion of the actual inner and outer walls is indicated by a bar graph and a numerical value of 190. °C. Further, in the zone Z3, the temperature of the middle portion of the inner and outer walls is set to 200 ° C (set value 200 ° C), and the temperature of the middle portion of the actual inner and outer walls is represented by a bar graph and a numerical value of 200. °C. Further, in the zone Z4, the temperature of the middle portion of the inner and outer walls is set to 200 ° C (set value 200 ° C), and the temperature of the middle portion of the actual inner and outer walls is indicated by a bar graph and a numerical value as 200 ° C. In the areas Z15 _a and Z15 _b , the temperature of the middle part of the inner and outer walls is also set to 200 ° C (set value 200 ° C), and the temperature of the middle part of the actual inner and outer walls is shown by the straight bar graph and numerical value. It is 200 °C.

In the example shown in Fig. 4, the temperature of the cylinder 11 is made to be the same as the set value in each region. The setting can be made while referring to the graph 31 of the estimated temperature of the inner wall of the cylinder 11.

In this way, since each of the heaters h1 to h3 disposed along the axial direction is provided with one set of temperature sensors, the temperature of the region heated by one heater can be estimated at one of the axial directions, and based on The estimated value shows the chart 31. Therefore, for example, in the examples of Figs. 1 and 2, the first region 21 controlled by the heater h1 becomes the estimated region of the temperature sensors A-1, A-2.

Further, the estimated temperature of the inner wall displayed by the graph 31 and the detected value of the temperature sensor shown in the bar graph fields 32 to 37 can be compared. For example, even the middle part of the inner and outer wall surfaces and the temperature sense near the outer wall When the inspection values of the reactors are all the same, the molten state of the resin is not necessarily stable. Therefore, by comparing the estimated temperature of the inner wall shown in the graph 31 and the detected value of the temperature sensor shown in the bar graph fields 32 to 37, it is possible to grasp whether the temperature inside the cylinder in the diameter direction is high or low. For example, in the region Z3, when the temperature shown in the straight line graph 34 is 200 ° C, the estimated temperature of the inner wall shown in the graph 31 is about 210 ° C, which represents the temperature near the inner wall, that is, the resin. The temperature is higher. In this way, by grasping the fluctuation of the estimated temperature in the inner wall along the cylinder axis direction, the stability can be confirmed by the temperature distribution, and the stability of the molten state of the resin can be grasped.

In addition, the heat retention set temperature is displayed below the temperature set point. In Fig. 4, the heat retention set temperature is set to 100 °C. The heat retention set temperature is a temperature for preheating the resin in the cylinder 11 when the operation of the injection molding machine has stopped. The temperature monitoring range is displayed below the set temperature. Here, the temperature monitoring range is set to 20 °C. Further, under the temperature monitoring range, it is shown whether temperature monitoring is performed in each area. In the example shown in Fig. 4, in the areas Z1, Z2, Z4, Z15a, and Z15b, temperature monitoring is scheduled, so "ON" is displayed. On the other hand, in the area Z3, the temperature monitoring is not performed, so "ON" is not displayed.

In addition to the above display items, in order to prevent the screw 11 from being started up in the cooling state of the cylinder 11, there is an item showing that the anti-screw cooling start time is set to "15 minutes". In addition, there is a display item in which the heater 11 is set to "insulation" when the abnormality is generated, and the cylinder 11 is kept warm when the injection molding machine is abnormal.

As described above, in the display screen shown in FIG. 4, in the chart 31, The inner wall temperature of the cylinder 11 is indicated by a continuous line corresponding to the axial direction of the cylinder 11, so that by observing the graph 31, the resin temperature in the cylinder 11, that is, the resin state in the cylinder 11 can be easily The ground is mastered. In other words, the temperature of the inner wall of the cylinder 11 corresponds to the energy expression value in the vicinity of the inner wall of the cylinder 11, and therefore corresponds to the energy expression value of the resin in the cylinder 11.

Fig. 5 is a view showing a display screen 50 for displaying the temperature of the inner wall of the cylinder 11 along the axial direction of the cylinder 11. On the upper portion of the display screen 50 shown in Fig. 5, a graph 51 indicating the temperature of the inner wall of the cylinder 11 is displayed. The chart 51 is the same as the chart 31 shown in Fig. 4, except that the continuous line has a plurality of lines (two in the fifth figure) and the points are different. Among the two continuous lines, the continuous line indicated by the solid line indicates the line of the inner wall temperature at the current time with the continuous line of the graph 31 shown in Fig. 4, and the continuous line indicated by the broken line indicates the current line. The line of the inner wall temperature 15 minutes before the hour. That is, in the graph 51, the inner wall temperature of the past time point can be displayed in addition to the current inner wall temperature. Thereby, the transition of the temperature of the inner wall of the cylinder 11, that is, the transition of the resin state in the cylinder 11, can be more easily recognized.

In addition, the display contents other than the map 51 in the display screen 50 are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Fig. 6 is a view showing a display screen 60 for displaying the heat flux of the inner wall of the cylinder 11 along the axial direction of the cylinder 11. On the upper portion of the display screen 60 shown in Fig. 6, a graph 61 showing the inner wall heat flux of the cylinder 11 is shown. In the graph 61, the horizontal axis represents the axial direction of the cylinder 11, and the vertical axis represents the heat flux near the inner wall. In the horizontal axis of the graph 61, the left side is the nozzle side of the cylinder, and the right side is the cooling cylinder 14 side. Shown in Figure 61 The vertical line indicates the division line of the area. For example, the vertical line between the Z1 display and the Z2 display indicates the boundary position between the area Z1 and the area Z2 in the cylinder axis direction.

The so-called inner wall heat flux is a value indicating the heat transfer of the portion in contact with the resin in the inner wall of the cylinder 11. Although the graph 61 shows the continuous inner wall heat flux along the axis direction of the cylinder 11, the portion of the inner wall heat flux which is located on the plus side indicates that the movement of the heat energy is from the outer side of the cylinder 11 The inner side, and the portion of the inner wall heat flux which is located on the minus side means that the movement of thermal energy is from the inner side of the cylinder 11 toward the outer side. In other words, the inner wall heat flux is located on the positive side, the thermal energy is moved from the cylinder 11 (heater) to the resin, and the inner wall heat flux is on the negative side, and the thermal energy is moved from the resin. To the cylinder 11. Further, in the graph 61, the area S1, S2 indicating the continuous line of the inner wall heat flux which becomes the positive side portion indicates the heat flow rate from the inside of the cylinder 11 for the resin, and the heat flux of the inner wall. The area S3, S4 of the continuous line which becomes the negative side portion indicates the heat flow rate from the resin in the cylinder 11 to the cylinder 11.

As described above, by observing the graph 61, the direction of thermal energy movement, the moving speed, and the heat of movement of the respective portions of the cylinder 11 can be easily grasped, and the resin state in the cylinder 11 can be more easily Be judged. That is, the inner wall heat flux of the graph 61 corresponds to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore corresponds to the value indicated by the energy of the resin in the cylinder 11.

Further, the inner wall heat flux of the cylinder 11 is an estimated value calculated by an estimator. About the calculation of the estimator to obtain the inner wall heat flux The law is as described later. Further, the display contents other than the graph 61 in the display screen 60 are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Fig. 7 is a view showing a display screen 70 for displaying the heat flow rate in each region of the cylinder 11 and the temperature distribution in the cross section of the cylinder 11 along the axial direction of the cylinder 11. On the upper portion of the display screen 70 shown in Fig. 7, a heat flow display field 71 indicating the value of the heat flow rate in each region of the cylinder 11 and a distribution of the isotherms indicating the cross section of the cylinder 11 are displayed. Figure, which is the contour map 72. In the contour map 72, the portions surrounded by the isotherms are distinguished by color, but in Fig. 7, for the sake of convenience, they are separated by hatching in advance, and then by the type of hatching. color. The vertical line shown in the contour line 72 indicates the area dividing line. For example, the vertical line between the Z1 display and the Z2 display indicates the boundary position between the area Z1 and the area Z2 in the cylinder axis direction.

In the heat flow display field 71, the heat flow rate in each region of the cylinder 11 is shown by a numerical value. The value of the heat flow rate is in the positive value area, indicating that the movement of thermal energy is from the outer side toward the inner side of the cylinder 11, and the value of the heat flow rate is located in the negative value area, indicating that the movement of the thermal energy is from the cylinder 11 The inside is facing outward. In other words, if the value of the heat flow is in the positive region, the supply of heat is from the cylinder 11 to the resin, and the value of the heat flow is in the negative region, and the heat is dissipated toward the cylinder 11.

By observing the value of the heat flow rate shown in the heat flow display field 71 and the contour map 72, the direction of thermal energy movement of each portion of the cylinder 11, as well as the heat flow rate and the temperature distribution in the cylinder 11 can be easily grasped. Easier to judge The resin state in the cylinder 11 is broken. That is, the value of the heat flow rate and the contour map 72 shown in the heat flow rate display area 71 correspond to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore correspond to the energy of the resin in the cylinder 11. Indicates the value.

Further, the value of the heat flow rate indicated by the heat flow rate display field 71 is an estimated value calculated by the estimator. The method of calculating the heat flow using the calculation of the estimator is as described later. Further, the display contents other than the heat flow rate display area 71 and the contour map 72 in the display screen 70 are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted. Further, although the fields surrounded by the isotherms in Fig. 7 are displayed by color, they can be displayed separately by color for each isotherm.

Fig. 8 is a view showing a display screen 80 for displaying the temperature of the inner wall in the axial direction of the cylinder 11 and the temperature distribution in the cross section of the cylinder 11 along the axial direction of the cylinder 11. On the upper portion of the display screen 80 shown in Fig. 8, there is shown a graph 81 indicating the temperature of the inner wall along the axial direction of the cylinder 11, and a contour line 82 indicated by the isotherm in the cross section of the cylinder 11. . The contour map 82 is the same as the contour map 72 shown in Fig. 7. The portion surrounded by the isotherm is distinguished by color. However, in Fig. 8, the area is hatched in advance for convenience. Separate, and then distinguish the color by the type of hatching. The vertical line shown in the contour line diagram 82 indicates the section line of the area. For example, the vertical line between the Z1 display and the Z2 display indicates the boundary position between the area Z1 and the area Z2 in the cylinder axis direction.

The chart 81 is the same as the chart 31 shown in FIG. 4, but a horizontal axis is set as the time axis, and the time axis is used to display the past time. Inner wall temperature. In the graph 81, the solid line indicates the inner wall temperature at the current time, the broken line indicates the inner wall temperature at the time of 10 minutes, and the one-point chain indicates the inner wall temperature at the time before 20 minutes. . Moreover, the dotted line and the one-point chain line are not necessarily different, and can also be displayed by color. In this case, since the respective conditions can be separated from the screen, the type of the line can be easily judged underground, and misidentification can be prevented.

By observing the current and past inner wall temperatures and the contour map 82 shown in the graph 81, the temperature transition of each portion of the cylinder 11 can be easily grasped, and the state of the resin in the cylinder 11 can be easily judged. That is, the inner wall temperature and the contour map 82 shown in the graph 81 correspond to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore correspond to the value indicated by the energy of the resin in the cylinder 11.

Further, the value of the inner wall temperature shown in the graph 81 is an estimated value calculated by the estimator. The method of calculating the inner wall temperature by the calculation of the estimator will be described later. Further, the display contents other than the graph 81 and the contour map 82 in the display screen 80 are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Fig. 9 is a view showing a display screen 85 for displaying the temperature of the cylinder in the axial direction of the cylinder 11 and the temperature distribution in the cross section of the cylinder 11 along the axial direction of the cylinder 11. On the upper portion of the display screen 85 shown in Fig. 9, a graph 86 showing the cylinder temperature in the axial direction of the cylinder 11 and a contour line indicated by the isotherm in the cross section of the cylinder 11 are shown. . The contour map 82 is the same as the contour map 72 shown in Fig. 7, and the portion surrounded by the isotherm is distinguished by color, but in Fig. 8, the square is In the first place, it is separated by hatching in advance, and the color is distinguished by the type of hatching.

The graph 86 is the same as the graph 31 shown in Fig. 4, but a horizontal axis is often provided as an axis indicating the distance from the inner wall surface of the cylinder. Thereby, the temperature of the cylinder at different distances away from the inner wall surface of the cylinder can be displayed in the graph 86. The solid line in the graph 86 indicates the inner wall temperature at the position corresponding to the inner wall surface of the cylinder (the distance is zero), and the broken line indicates the cylinder temperature at a distance of about 10 mm away from the inner wall surface of the cylinder, and the one-point chain system Indicates the temperature of the cylinder at a distance of about 20 mm from the inner wall surface of the cylinder. Moreover, in this case as well as Fig. 8, the dotted line and the one-point chain line are not necessarily different, and the color can be used for distinguishing and displaying. In this case, since the respective conditions can be separated from the screen, the type of the line can be easily judged underground, and misidentification can be prevented.

By observing the cylinder temperature at a complex distance and the contour map 82 shown in the graph 86, the temperature inside the cylinder 11 can be easily grasped, and the state of the resin in the cylinder 11 can be easily judged. That is, the cylinder temperature and the contour map 82 shown in the graph 86 correspond to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore correspond to the value indicated by the energy of the resin in the cylinder 11.

Further, the value of the temperature shown in the graph 86 is an estimated value calculated by the estimator. The method of calculating the temperature using the calculation of the estimator is as described later. Further, the display contents other than the graph 86 and the contour map 82 in the display screen 85 are the same as those on the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Fig. 10 is a view showing a display screen 90 for displaying the heat flow rate in each area of the cylinder 11. On the upper portion of the display screen 90 shown in Fig. 10, a graph 91 showing the flow rate of heat in each region of the cylinder 11 is displayed. The graph 91 shows the heat flow rate in each region of the cylinder 11 by an arrow. The position of the arrow indicates the position in the cylinder axis direction in the area shown below. The direction of the arrow indicates the direction of thermal energy movement, and the size of the arrow indicates the amount of heat flow. In addition, the heat flow rate in the zones Z15a and Z15b is small, so it is indicated by an asterisk without an arrow, and the arrow in the zone Z1 is cut off because the front end of the arrow exceeds the range of the chart. The state of the drop. The above-mentioned arrows correspond to the values of the heat flow rate in Fig. 7.

In the region where the arrow of the heat flow direction is toward the positive side (downward), it means that the movement of the thermal energy is from the outer side toward the inner side of the cylinder 11, and the arrow of the heat flow is toward the negative side (upward). In the region, the movement of the thermal energy is from the inside to the outside of the cylinder 11. In other words, in the region where the arrow of the heat flow is toward the positive side, the supply of thermal energy is from the cylinder 11 to the resin, and in the region where the arrow of the heat flow is toward the negative side, the movement of the thermal energy is from The resin is directed to the cylinder 11.

By observing the arrow of the heat flow rate shown in the graph 91, the direction of thermal energy movement and the heat flow rate of each portion of the cylinder 11 can be easily grasped, and the state of the resin in the cylinder 11 can be easily judged. That is, the arrow of the heat flow rate shown in the graph 91 corresponds to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore corresponds to the value indicated by the energy of the resin in the cylinder 11.

The vertical lines shown in the graph 91 indicate the positions of the temperature sensors in the regions Z1 to Z15b shown below. For example, where Z1 is located The vertical line directly above indicates the position of the temperature sensor A-1 disposed in the zone Z1 along the cylinder axis direction.

Further, the value of the heat flow rate indicated by the arrow is an estimated value calculated by the estimator. The method of calculating the heat flow using the calculation of the estimator is as described later. Further, the display contents other than the graph 91 in the display screen 90 are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Fig. 11 is a view showing another example of a display screen for displaying the heat flux of the inner wall in each region of the cylinder. On the upper portion of the display screen 90A shown in Fig. 11, a graph 91A showing the heat flow rate in each region of the cylinder 11 is displayed. Graph 91A shows the heat flow rate in each region of the cylinder 11 in a bar graph. The position of the bar graph indicates the position in the cylinder axis direction in the area shown below, and is the position where the corresponding temperature sensor is provided. The positive (+) and negative (-) sides of the vertical axis of the graph 91A indicate the direction of movement of thermal energy, while the height of the straight bar indicates the magnitude of the heat flow. In addition, since the heat flow rate in the regions Z15a and Z15b is as small as to drive near zero, a bar graph is not displayed. Further, since the value of the heat flow rate in the zone Z1 is outside the range of the graph, the front end of the bar graph appears to be truncated. The above straight line graph corresponds to the value of the heat flow rate in Fig. 7.

In the region where the bar graph of the heat flow is toward the positive side (downward), it means that the movement of the thermal energy is from the outside toward the inside of the cylinder 11, and the bar graph of the heat flow is toward the negative side ( In the region extending upward, it means that the movement of thermal energy is from the inside to the outside of the cylinder 11. In other words, in the region where the bar graph extends toward the positive side, the supply of thermal energy is from the circle The barrel 11 is directed toward the resin, and in the region where the bar graph of the heat flow is toward the negative side, the movement of the heat energy is from the resin to the cylinder 11.

By linearly extending the bar graph extending toward the positive side and the bar graph extending toward the negative side by, for example, color, and attaching different hatching patterns to display, the bar graph can be instantly recognized. Shows the direction of thermal energy movement. In Fig. 11, the straight bar graph extending toward the positive side and the straight bar graph extending toward the negative side have different hatching methods.

By observing the bar graph of the heat flow rate shown in the graph 91A, the direction of thermal energy movement and the heat flow rate of each portion of the cylinder 11 can be easily grasped, and the state of the resin in the cylinder 11 can be easily judged. That is, the bar graph of the heat flow rate shown in the graph 91A corresponds to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore corresponds to the value indicated by the energy of the resin in the cylinder 11.

The vertical lines shown in the graph 91A indicate the positions of the temperature sensors in the regions Z1 to Z15b shown below. For example, the vertical line located immediately above Z1 indicates the position of the temperature sensor A-1 disposed in the zone Z1 along the cylinder axis direction.

Further, the value of the heat flow rate shown in the bar graph is an estimated value calculated by the estimator. The method of calculating the heat flow using the calculation of the estimator is as described later. Further, the display contents other than the chart 91A in the display screen 90A are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Fig. 12 is a view showing a display screen 95 for displaying the heat flow rate in each area of the cylinder 11. In the upper part of the display screen 95 shown in Fig. 12, The heat flow display field 96 for indicating the heat flow value in each region of the cylinder 11 is provided. In the heat flow display field 96, the heat flow rate in each region of the cylinder 11 is shown by numerical values. The numerical symbol indicates the direction of movement of thermal energy, and the magnitude of the absolute value of the value indicates the magnitude of the heat flow. The heat flow rate shown in the heat flow display field 96 is the same as the heat flow indicated by the arrow in Fig. 10, and is displayed by the numerical value, and is the same as the heat value of Fig. 7.

By observing the sign and absolute value of the heat flow indicated by the heat flow display field 96, the thermal energy moving direction and the heat flow rate of each part of the cylinder 11 can be easily grasped, and the resin state in the cylinder 11 can be easily judged. . That is, the value of the heat flow rate indicated by the heat flow rate display field 96 corresponds to the value indicated by the energy in the vicinity of the inner wall of the cylinder 11, and therefore corresponds to the value indicated by the energy of the resin in the cylinder 11.

Further, the value of the heat flow rate indicated by the number is an estimated value calculated by the estimator. The method of calculating the heat flow using the calculation of the estimator is as described later. Further, the display contents other than the field 96 in the display screen 95 are the same as those of the display screen 30 shown in FIG. 4, and therefore the description thereof will be omitted.

Next, an estimation method for estimating the inner wall temperature and the heat flow rate of the cylinder 11 will be described.

Fig. 13 is a schematic view showing the configuration of an estimator 140 for determining the heat flux in the normal direction of the interface between the cylinder 11 (the inner wall surface and the side end surface of the cooling cylinder 14, the mold contact surface, and the outer surface). The estimator 140 is composed of an electronic circuit and/or a software program in the controller 130, and includes a mold of the cylinder 11. Model 142 and filter 144.

Here, the controller does not have to be provided in the same control device as the controller for controlling the respective driving portions of the injection molding machine. For example, the control device of the injection molding machine may be another general PC. Further, it may be a screen for managing the centralized management device of the operation state of the plurality of injection molding machines.

In the estimator 140, the heat transfer characteristics of the cylinder 11 are memorized in advance. Alternatively, the estimator 140 is fabricated based on the heat transfer characteristics of the particular cylinder in a manner to fit a particular cylinder. The heat transfer characteristics of the cylinder 11 are expressed by dividing the entire cylinder 11 into a limited number of fields, and will include at least "temperature of each field", "time differentiation of temperature in each field", "various fields and resins, screws" The quantitative relationship between the physical quantities such as the heat flow rate, the "temperature of the atmosphere", and the "on duty" of the heater of the heating cylinder is expressed by the following linear algebraic equation (1). The linear algebraic equation (1) corresponds to the mode 142.

In the above linear algebraic equation, each symbol system represents the following elements: θ ₁ . . . θ _n : temperature in each field Qi ₁ . . . Qi _m : heat flow between various fields and resin and screw θ _a : atmospheric temperature η ₁ . . . η _p : operation of the heater for heating the cylinder (actuation time) t: time C: heat capacity in each field α: thermal conductivity coefficient between fields R _i : indicates the rank of the field in direct thermal contact with the resin and the screw α _o : Heat transfer coefficient to the atmosphere exothermic (also indicates the characteristics of the cylinder cover, thermocouple, installation state) Q _h : the ability of each heater to heat each field under the fixed action (also indicates the heat distribution, configuration, heat of the heater) Contact state)

In the estimator 140, the mode 142 of the cylinder 11 maintains the estimated value of the temperature of each field of the current cylinder 11. Then, the estimator 140 can be represented by "temperature in each field", "heat flow rate between each field and resin, screw", "temperature of the atmosphere", and "actuation of the heater of the heating cylinder". The equation (1) of the heat transfer characteristics of the cylinder 11 is calculated as "time differentiation of temperature in each field". Here, n fields corresponding to the respective fields θ are arranged to surround m fields corresponding to the heat flow rate Q. Further, the operation η of the heater is arranged in p corresponding to the number of heaters. Then, in accordance with the calculated "time differentiation of temperature in each field" and "correction data of temperature in each field" described later, the estimated value of "temperature in each field" maintained by mode 142 is increased or decreased. Using the estimated value of "temperature in each field", the temperature of the inner wall and any depth position can be calculated and displayed by interpolation or extrapolation. Thereby, the temperatures indicated by the 31, 51, 81, 86 and contour maps 72, 82 of Figs. 4 to 9 can be displayed on the screen.

"Remediation of temperature in various fields" and "heat flow" are filtered Obtained by the device 144. The filter 144 extracts the deviation value of the estimated value of the field temperature corresponding to the detected value in the "detected value of the entire temperature" and the estimated value of the "temperature of each field" maintained by the mode 142. The "detection value of the entire temperature" is the detection value of the temperature sensor provided in the nozzle and the heating cylinder. Then, the filter 144 outputs "heat flow rate between each area and the resin and the screw" and "correction data of each field temperature" in the mode 142. The filter 144 is preferably a person who can perform differential and integral calculations. Using the "heat flow rate between each field and the resin and the screw" output here, the graphs 61, 91 and the display fields of Fig. 6, Fig. 7, Fig. 10, Fig. 11, Fig. 12 can be used. The heat flux or heat flow indicated by 71, 96 is displayed on the screen.

Further, it is also possible to interpolate the detected values of the respective temperature sensors in accordance with the respective fields generated by the mode, and calculate the detected values of the temperatures in the respective fields. In this case, the deviation value in all fields can be obtained.

As described above, the heat flux in the normal direction of the boundary surface (the inner wall surface and the side end surface of the cooling cylinder 14, the mold contact surface, and the outer surface) of the cylinder 11 is based on the heater for heating the cylinder 11. The actuation command value (the command value on duty) and the temperature detection value obtained by the temperature sensor are estimated by the estimator 140. The "heat flow rate" and "estimated value of temperature" calculated here are displayed on the screen of the display input device 135. Furthermore, the temperature detection value detected by the actual heating cylinder can also be displayed on the screen of the display input device 135.

Further, the heat flux located on the boundary surface of the cylinder 11 is not limited to the above-described method of obtaining by the estimator, and may be set by, for example, temperature setting conditions. The molding conditions are used to perform simulations such as thermal analysis and resin flow analysis, and are calculated based on the values obtained by the simulation.

Fig. 14 is a diagram showing another principle of the estimator 150 for determining the temperature of the cylinder 11. The estimator 150 is comprised of electronic circuitry and/or software programs within the controller 130 and includes a mode 152 of the cylinder 11 and a filter 154.

In the estimator 150, the heat transfer characteristics of the cylinder 11 are memorized in advance. Alternatively, the estimator 150 is made based on the heat transfer characteristics of the particular cylinder in a manner to fit a particular cylinder. The heat transfer characteristics of the cylinder 11 are expressed by dividing the entire cylinder 11 into a limited number of fields, and will include at least "temperature of each field", "time differentiation of temperature in each field", "various fields and resins, screws" The quantitative relationship between the physical quantities such as the heat flow rate, the "temperature of the atmosphere", and the "actuation of the heater of the heating cylinder" is expressed by the above-described linear algebraic equation (1). The linear algebraic equation (1) corresponds to the mode 152.

In the estimator 150, the mode 152 of the cylinder 11 maintains the estimated value of "temperature of each field" in all fields except the field of the inner wall of the conventional cylinder 11. Therefore, the estimator 150 can detect the "temperature of each field" from the field of the inner wall and the "temperature of each field" in the inner wall field, "the temperature of the atmosphere", and "the operation of the heater of the heating cylinder". The equation (1) indicating the heat transfer characteristics of the cylinder 11 is used to calculate the "time differential of temperature in each field" other than the inner wall region. Then, in accordance with the "time differentiation of temperature in each field" other than the calculated inner wall area and the "correction data of temperature in each field" described later, the mode 152 is maintained by itself. Estimated value of "temperature in each field" outside the wall area. By using the estimated value of "temperature in each field", the temperature distribution of the axial cross-section of the cylinder 11 shown by the contour maps 72, 82 of Figs. 7, 8 and 9 can be displayed on the screen.

In addition, the detection value of the "temperature of each field" in the field of the inner wall is time-differentiated, and the result is compared with the "temperature of each field" in the field of the inner wall and the "temperature of each field" outside the inner wall. The estimated value, the "temperature of the atmosphere", and the "actuation of the heater of the heating cylinder" are similarly calculated by the equation (1) indicating the heat transfer characteristics of the cylinder 11, and the calculation is made between the respective fields and between the resin and the screw. Heat flow." The heat flux shown in Fig. 6, Fig. 7, Fig. 10, Fig. 11, Fig. 12, and the display fields 71, 96 can be obtained by using the "heat flow rate" calculated here. Or heat flow is displayed on the screen. Further, the inner wall temperature or the cylinder temperature indicated by the graphs 31, 51, 81, 86 and the contour maps 72 and 82 of Figs. 4 to 9 are detected by the temperature sensor disposed near the inner wall. To express it.

The "correction data for each field temperature" is obtained by the filter 154. The filter 154 extracts the deviation value of the estimated value of the field temperature corresponding to the detected value in the "detected value of the entire temperature" and the estimated value of the "temperature of each field" maintained by the mode 152. The "detection value of the entire temperature" is the detection value of the temperature sensor provided in the nozzle and the heating cylinder. Then, the filter 154 outputs "correction data for each field temperature" in the mode 152. The filter 154 is preferably a person who can perform differential and integral calculations.

In addition, it is also possible to interpolate the detected values of the temperature sensors in accordance with the manners of the various fields generated by the mode, and calculate the temperature of each field. The detected value. In this case, the deviation value in all fields can be obtained.

As described above, the temperature of the cylinder 11 is estimated based on the operation command value (the command value on duty) of the heater for heating the cylinder 11 and the temperature detection value obtained by the temperature sensor, and is estimated by the estimator 150. . Next, not only the "heat flow rate" calculated in the mode 152 but also the "heat flux" is displayed. Further, the "temperature estimated value" and the "temperature detected value" are used to calculate and display the temperature of the inner wall and the arbitrary depth position by interpolation or extrapolation. Furthermore, the temperature detection value detected by the actual heating cylinder can also be displayed on the screen of the display input device 135.

Further, the heat flux located on the boundary surface of the cylinder 11 is not limited to the above-described method by the estimator, and the simulation of the thermal analysis and the resin flow analysis may be performed by, for example, temperature setting conditions and molding conditions. Then, based on the value obtained by the simulation, it is calculated.

Fig. 15 is a schematic diagram showing the principle of the estimator 160 for determining the heat flux in the normal direction of the boundary surface (the inner wall surface, the side end surface of the cooling cylinder 14, the mold contact surface, and the outer surface) of the cylinder 11. The estimator 160 is comprised of electronic circuitry and/or software programs within the controller 130 and includes a mode 162 of the cylinder 11 and a filter 164.

Here, the controller does not have to be provided in the same control device as the controller for controlling the respective driving portions of the injection molding machine. For example, the control device of the injection molding machine may be another general PC. Further, it may be a screen for managing the centralized management device of the operation state of the plurality of injection molding machines.

In the estimator 160, the heat transfer characteristics of the cylinder 11 are memorized in advance. Or, in a manner that fits into a particular cylinder, based on that particular cylinder The heat transfer characteristics are used to make the estimator 160. The heat transfer characteristics of the cylinder 11 are expressed by dividing the entire cylinder 11 into a limited number of fields, and will include at least "temperature of each field", "time differentiation of temperature in each field", "various fields and resins, screws" The quantitative relationship between physical quantities such as heat flow is presented in the following linear algebraic equation (2). This linear algebraic equation (2) corresponds to mode 162.

In the above linear algebraic equation, each symbol system represents the following elements: θ _i1 . . . θ _im : temperature θ _o1 of each field inside the cylinder (near the inner wall). . . θ _on : the temperature of each field outside the cylinder (near the outer wall) Qi ₁ . . . Qi _m : heat flow rate between the inside of the cylinder and the resin and the screw t: time C: heat capacity in each field inside the cylinder α _i : thermal conductivity between various fields inside the cylinder α _o : outside the cylinder The thermal conductivity coefficient R _i between the various fields indicates the rank of the field of direct thermal contact with the resin and the screw

In the estimator 160, the mode 162 of the cylinder 11 maintains the estimated value of the temperature of each field on the inner side (near the inner wall) of the current cylinder 11. Then, the estimator 160 can express the heat transfer of the cylinder 11 by "temperature of each field inside the cylinder", "temperature of each field outside the cylinder", "heat flow rate between each field and resin, and screw". According to the characteristic formula (2), "the time differential of the temperature of each field inside the cylinder" is calculated. Here, the n fields corresponding to the outer field temperature θ _o are arranged so as to surround m fields corresponding to the inner field temperature θ _i and m fields corresponding to the heat flow rate Q. Then, in accordance with the calculated "time differentiation of the temperature of each area inside the cylinder" and the "correction data of the temperature of each area" described later, the "temperature of each area inside the cylinder" maintained by the mode 162 is increased or decreased. Estimated value. Using the estimated value of "temperature in each field", the temperature of the inner wall and any depth position can be calculated and displayed by interpolation or extrapolation. Thereby, the temperatures indicated by the 31, 51, 81, 86 and contour maps 72, 82 of Figs. 4 to 9 can be displayed on the screen.

The "correction data for each field temperature inside the cylinder" and "heat flow rate" are obtained by the filter 164. The filter 164 extracts the deviation value of the estimated value of the field temperature corresponding to the detected value in the estimated value of the "detected value of the entire temperature" and the "temperature of each field inside the cylinder" maintained by the mode 162. The "detection value of the entire temperature" is the detection value of the temperature sensor provided in the nozzle and the heating cylinder. Then, the filter 164 outputs "heat flow rate between the inside of the cylinder and the resin and the screw" and "correction data of the respective fields inside the cylinder" in the mode 162. The filter 164 is preferably a person who can perform differential and integral calculations. Using the "heat flow rate between the inside of the cylinder and the resin and the screw" outputted here, the graph 61 of Fig. 6, Fig. 7, Fig. 10, Fig. 11, and Fig. 12 can be used. 91 and display fields 71, 96 represent the heat flux or heat flow display On the screen.

Further, it is also possible to interpolate the detected values of the respective temperature sensors in accordance with the respective fields generated by the mode, and calculate the detected values of the temperatures in the respective fields. In this case, the deviation value in all fields can be obtained.

As described above, the heat flux in the normal direction of the boundary surface (the inner wall surface, the side end surface of the cooling cylinder 14, and the mold contact surface) of the cylinder 11 is estimated based on the temperature detection value obtained by the temperature sensor. The device 160 is presumed. The "heat flow rate" and "estimated value of temperature" calculated here are displayed on the screen of the display input device 135. Furthermore, the temperature detection value detected by the actual heating cylinder can also be displayed on the screen of the display input device 135.

Here, as shown in FIG. 1 and FIG. 2, a group of temperature sensors respectively corresponding to the heaters h1 to h3 disposed along the axial direction will be described as an example. However, it is also possible to configure a multi-array temperature sensor for one heater along the axial direction. For example, a plurality of temperature sensors A-1 and A-2 may be arranged for the heater h1. In this case, the first region 21 controlled by the heater h1 is divided into a plurality of estimated regions. Therefore, even in one area, the temperature in the complex estimation field can be grasped. In this case, the temperature of each of the putative fields can be displayed.

More specifically, as shown in Fig. 16, the heating cylinder 11 and the injection nozzle 105 are divided into four regions along the longitudinal direction from the cooling cylinder 14 to the injection nozzle 105. Here, the four regions are referred to as the first region 21, the second region 22, the third region 23, and the fourth region 24 in the order of the regions adjacent to the cooling cylinder 14. Therefore, the nozzle 105 forms the fourth Area 24. Further, the cooling cylinder 14 is a cylinder provided to cool the funnel 12 and its vicinity, and is also provided to maintain the circumference of the funnel 12 at a constant temperature or lower.

In the first to third regions 21 to 23, as shown in Fig. 1, energized band heaters h1, h2, and h3 are individually disposed on the outer periphery of the heating cylinder 11. Further, although not shown here, a heater is provided around the nozzle 105 for heating the nozzle 105. This heater is referred to as heater h4. Further, as shown in Fig. 16, in the first region 21, three sets of temperature sensors A-1, A-2, B-1, B-2, and C-1 are arranged along the long axis direction. C-2. Similarly, three sets of temperature sensors D-1, D-2, E-1, E-2, F-1, and F-2 are disposed in the second region 22, and are also disposed in the third region 23. There are three sets of temperature sensors G-1, G-2, H-1, H-2, I-1, I-2. Further, two sets of temperature sensors J-1, J-2, K-1, and K-2 are provided in the fourth region 24.

As described above, by arranging a plurality of temperature sensors on the heating cylinder 11, the heat flow rate and the heat flux can be obtained from the actual measured values using an algorithm.

The present invention is not limited to the specific embodiments disclosed above, and various modifications and improvements thereof are within the scope of the present invention.

The entire contents of the Japanese Patent Application No. 2007-144405 and No. 2007-144406, filed on May 31, 2007, are incorporated herein by reference.

[Industry profitability]

The present invention is applicable to an injection molding machine having a display device.

10‧‧‧Injection device

11‧‧‧heating cylinder

12‧‧‧ funnel

13‧‧‧ screw

14‧‧‧Cooling cylinder

14a‧‧‧Cooling water pipes

14b‧‧‧ thermocouple

30, 50, 60, 70, 80, 85, 90, 90A, 95‧‧‧ display

31,51,61,81,86,91,91A,95‧‧‧ Chart

32-37‧‧‧Bar chart area

38-43‧‧‧ Numerical display field

71,96‧‧‧Hot flow display field

72,82‧‧‧ contour map

105‧‧‧Injection nozzle

H1, h2, h3, h4, ‧‧ ‧ heater

21~24‧‧‧Area

130‧‧‧ Controller

135‧‧‧ display input device

140, 150, 160‧‧‧ estimator

142,152,162‧‧‧ mode

144,154,164‧‧‧Filter

A-1~K-1, A-2~K-2‧‧‧ temperature sensor

200‧‧‧Injection device

202‧‧‧Resin Measurement Department

204‧‧‧Resin Injection Department

206‧‧‧ screw cylinder

208‧‧‧ screw

210,218‧‧‧heater

212‧‧‧Plunger cylinder

214‧‧‧Plunger

216‧‧‧Plunger Drive Department

301‧‧‧ Temperature Control Department

302-1~302-4‧‧‧Switcher

303‧‧‧Power supply

351‧‧‧ Temperature detection value display unit

352‧‧‧ Temperature setting department

Figure 1 is a cross-sectional view of the injection device.

Fig. 2 is a view showing the configuration of a temperature control device for controlling the temperature of the heating cylinder.

Fig. 3 (a) to (c) are cross-sectional views showing a plane perpendicular to the axial direction of the heating cylinder shown in Fig. 2.

Fig. 4 is a view showing a display screen for displaying the temperature of the inner wall of the cylinder along the axial direction of the cylinder.

Fig. 5 is a view showing a display screen for displaying the inner wall temperature of the cylinder along the axial direction of the cylinder.

Fig. 6 is a view showing a display screen in which the heat flux of the inner wall of the cylinder is displayed along the axial direction of the cylinder.

Fig. 7 is a view showing a display screen in which the heat flux of the inner wall in each region of the cylinder and the temperature distribution in the cylinder section are displayed along the axial direction of the cylinder.

Fig. 8 is a view showing a display screen in which the temperature of the inner wall in the cylinder axis direction and the temperature distribution in the cylinder section are displayed along the axial direction of the cylinder.

Fig. 9 is a view showing a display screen in which the temperature in the cylinder axis direction and the temperature distribution in the cylinder section are displayed along the axial direction of the cylinder.

Fig. 10 is a view showing a display screen for displaying the heat flux of the inner wall in each region of the cylinder.

Fig. 11 is a view showing another example of a display screen for displaying the heat flux of the inner wall in each region of the cylinder.

Fig. 12 is a view showing a display screen for displaying the heat flux of the inner wall in each region of the cylinder.

Fig. 13 is a schematic diagram showing the principle of the estimator for determining the heat flux in the normal direction of the cylindrical interface (the inner wall surface and the side end surface of the cooling cylinder, the mold contact surface, and the outer surface).

Figure 14 is a schematic diagram of the principle of the estimator used to determine the temperature of the cylinder.

Fig. 15 is a schematic diagram showing the principle of the estimator for determining the heat flux in the normal direction of the cylindrical interface (the inner wall surface and the side end surface of the cooling cylinder, the mold contact surface, and the outer surface).

Figure 16 is a diagram showing the mounting of a plurality of temperature sensors on a cylinder.

Fig. 17 is a cross-sectional view showing an example of an injection device of a Puripura type injection molding machine.

10‧‧‧Injection device

11‧‧‧heating cylinder

12‧‧‧ funnel

13‧‧‧ screw

14‧‧‧Cooling cylinder

14a‧‧‧Cooling water pipes

14b‧‧‧ thermocouple

102‧‧‧Scraper

103‧‧‧Scraper

104‧‧‧ spiral groove

105‧‧‧Injection nozzle

106‧‧‧Nozzle mouth

107‧‧‧ screw head

108‧‧‧ Sealing Department

112‧‧‧Resin supply port

113‧‧‧Continuous

115‧‧‧Resin fragments

H1, h2, ‧‧ ‧ heater

S1, S2, S3‧‧‧ area

Claims (22)

A display device for an injection molding machine that kneads a resin while kneading a resin while generating a heat of fusion by a heater provided on a cylinder to supply heat energy to the resin in the cylinder. The energy in the vicinity of the inner wall of the cylinder calculated based on the temperature detection value obtained by the temperature detector disposed along the axial direction of the cylinder corresponds to the axial position of the cylinder. The energy is the estimated value estimated based on the actuation command value of the heater, the temperature detection value obtained by the temperature detector, and the heat flow rate. A display device for an injection molding machine that kneads a resin while kneading a resin while generating a heat of fusion by a heater provided on a cylinder to supply heat energy to the resin in the cylinder. The energy in the vicinity of the inner wall of the cylinder calculated based on the temperature detection value obtained by the temperature detector disposed along the axial direction of the cylinder corresponds to the axial position of the cylinder. The energy is a predetermined value calculated based on an analog value calculated by a predetermined temperature setting condition and a molding condition. The display device of the injection molding machine according to claim 1 or 2, wherein the energy is displayed as a continuous line indicating a value at a position along an axial direction of the cylinder. The display device of the injection molding machine described in claim 3 of the patent application scope The continuous line is displayed at a plurality of times or at different positions in the diameter direction of the cylinder, and is displayed in a plurality of lines. A display device for an injection molding machine according to claim 4, wherein the temperature distribution of the cross section of the cylinder is displayed. The display device of the injection molding machine according to claim 1 or 2, wherein the energy is displayed by an arrow indicating a value of a position along an axial direction of the cylinder. The display device of the injection molding machine according to claim 1 or 2, wherein the energy is displayed in a bar graph indicating a value of a position along an axial direction of the cylinder. The display device of the injection molding machine according to the first or second aspect of the invention, wherein the energy is displayed by a value at a position along an axial direction of the cylinder. The display device of the injection molding machine according to claim 1 or 2, wherein the energy is at least one of a temperature, a heat flux, and a heat flow rate. The display device of the injection molding machine according to the first or second aspect of the invention, wherein the temperature setting value at a plurality of positions along the axial direction of the cylinder and the vicinity of the inner wall of the cylinder are simultaneously displayed. A chart of energy. The display device of the injection molding machine according to claim 1 or 2, wherein the temperature setting value at a plurality of positions along the axial direction of the cylinder and the circle indicating the plural position are simultaneously displayed a graph of energy near the inner wall of the barrel; indicating the position of energy in the above chart The position corresponds to the above complex position of the cylinder. The display device of the injection molding machine according to claim 1 or 2, wherein a cooling cylinder is provided on a rear end side of the cylinder; and at the same time, a temperature detection value of a predetermined position of the cooling cylinder is displayed. And a graph showing the energy in the vicinity of the inner wall of the cylinder. The display device of the injection molding machine according to the first or second aspect of the invention, wherein the injection molding machine is a Puripura type injection molding machine having a plunger for emitting molten resin in the cylinder. The display device of the injection molding machine according to claim 13, wherein the cylinder is a cylinder containing the screw. The display device of the injection molding machine according to claim 13, wherein the cylinder is a cylinder including the plunger. A display device for an injection molding machine that kneads a resin while kneading a resin while generating a heat of fusion by a heater provided on a cylinder to supply heat energy to the resin in the cylinder. The energy of the cylinder is calculated based on a temperature detection value obtained by using a temperature detector disposed along an axial direction of the cylinder to correspond to a plurality of positions in the axial direction of the cylinder. The line is displayed; wherein the energy is an estimated value estimated based on an operation command value of the heater, the temperature detection value obtained by the temperature detector, and a heat flow rate. A display device for an injection molding machine that uses a rotation of a screw to knead a resin while generating heat of fusion while being used in a circle The heater on the cylinder is configured to supply thermal energy to the resin in the cylinder, and is calculated based on a temperature detection value obtained by using a temperature detector disposed along an axial direction of the cylinder. The energy of the cylinder is displayed by a plurality of lines corresponding to the axial direction position of the cylinder; wherein the energy is calculated based on an analog value calculated by a predetermined temperature setting condition and a molding condition. value. A display device for an injection molding machine according to claim 16 or 17, wherein at least one of the plurality of lines is used to indicate energy in the vicinity of an inner wall of the cylinder. The display device of the injection molding machine of claim 16 or 17, wherein the energy is a temperature or a heat flux. The display device of the injection molding machine according to claim 16 or 17, wherein the temperature distribution of the cross section of the cylinder is shown. The display device of the injection molding machine according to the above aspect of the invention, wherein the injection molding machine is a Puripura type injection molding machine having a plunger for emitting molten resin in the cylinder. The display device of the injection molding machine according to claim 21, wherein the cylinder is a cylinder including the screw.