JP2014100889A - Molding method of injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a molding condition, to facilitate and hasten (streamline) setting work, and to always keep constant molding quality.SOLUTION: Successive trial moldings are performed by using successively-combined paired metal molds M1, M2,,,. When trial molding is performed by using the first paired metal molds M1, a predetermined parting open amount Lm is generated between the paired metal molds M1 when a material to be injected is packed, injection pressure Pi and mold clamping force Pc1 are acquired when a non-defective product is obtained, and the acquired injection pressure Pi is set as a molding condition of injection unit 1i side and the acquired mold clamping force Pc1 is set as an intrinsic molding condition of the first paired metal molds M1. When successive trial moldings are performed by using the second paired metal molds M2,,, the parting open amount Lm is generated between the paired metal molds M2,,, the injection pressure Pi and mold clamping force Pc2,,, are acquired when the non-defective product is obtained, and the acquired mold clamping force Pc2,,, is set as the intrinsic molding condition of the second paired metal molds M2,,, in the same manner as the trial molding is performed by using the first paired metal molds M1.

Description

  The present invention relates to a molding method for an injection molding machine in which molding is performed by a mold in which a shared fixed mold provided on a stationary platen and a plurality of movable molds provided on a movable platen are sequentially combined.

  Conventionally, a mold (assembly mold) in which a shared fixed mold provided on a fixed plate and a plurality of movable molds provided on a moving plate are sequentially combined is clamped by a mold clamping device, and the clamped set An injection molding machine that performs molding by injecting resin into a cavity of a mold by an injection device is known from Patent Documents 1 and 2.

  By the way, in this type of injection molding machine, since a common fixed mold and a plurality of the same movable molds are combined, a plurality of molds combined with each movable mold are basically the same mold. Since there are variations in dimensions and the like, they are not the same. After all, this variation has a problem of appearing as variations in molding quality. Therefore, in order to solve this problem, in Patent Document 1, by setting molding conditions for each of a plurality of movable molds having the same structure, the molding conditions can be corrected even if the movable mold has a manufacturing dimensional difference. For the purpose of enabling the injection molding of high quality molded products without the need, the fixed mold on the die plate side and the movable molds on the movable table side are alternately combined, and the fixed mold is When injection molding single or composite molded products alternately, the molding conditions for each combination of the fixed mold and each movable mold are the unique molding conditions for each movable mold, and each movable mold is recognized and displayed. The movable mold is specified before clamping with the fixed mold by reading the recognition display and the molding conditions are changed to the specific molding conditions of the movable mold, and then the movable mold and the fixed mold are clamped. An injection molding method for performing injection molding is disclosed. To have.

JP-A-8-164537 JP 2008-74031 A

  However, the injection molding method disclosed in Patent Document 1 described above has the following problems to be solved.

  First, when molding is performed by a general molding method in an injection molding machine, usually, molding conditions set on the injection apparatus side are larger than molding conditions on the mold clamping apparatus side. For example, since the mold clamping device only needs to completely clamp the mold, it is sufficient to set a maximum mold clamping force larger than the injection pressure. However, with the injection device, multiple stages of injection speed, injection pressure (limit pressure), and weighing It is necessary to set many molding conditions such as the start position, the measurement end position, the holding pressure, and the speed pressure switching position. Therefore, as in the prior art, the method for setting molding conditions for each mold unit requires that the normal molding conditions be set as many as the number of molds, and it takes time to set the molding conditions. Since it affects each other, the setting work itself becomes difficult.

  Secondly, since the molding conditions influence each other, the instability increases as the molding conditions to be set increase. In other words, even if the molding conditions are accurately initialized, the molding conditions are easily affected by changes in the state of the mold and changes in the external environment. In the end, relative variations in the molding conditions are likely to occur, and there is room for further improvement including the basic molding method from the viewpoint of continuously ensuring good molding quality.

  An object of the present invention is to provide a molding method of an injection molding machine that solves the problems existing in the background art.

  In order to solve the above-described problem, the molding method of the injection molding machine 1 according to the present invention sequentially uses a fixed mold Mc provided on the fixed platen 2 and a plurality of movable molds Mm1, Mm2,. The combined molds (assembled molds) M1, M2,... Are clamped by the mold clamping device 1c, and the resin R is injected and filled into the cavities of the clamped assembled molds M1, M2,. When molding is performed, trial molding is sequentially performed using the sequentially assembled molds M1, M2,..., And at the time of trial molding of the first assembled mold M1, a predetermined gap (party) is formed in the mold M1 at the time of injection filling. Nm (opening amount) Lm (Lmp, Lmr) is generated, and an injection pressure (molding injection pressure) Pi and a mold clamping force (molding mold clamping force) Pc1 at which good product molding is possible are obtained, and the obtained molding injection pressure Pi is used as the injection device 1i Set as the molding conditions of the The mold clamping force Pc1 is set as a unique molding condition of the first mold M1, and on the other hand, the parting opening is performed on the mold M2 at the time of injection filling at the time of trial molding after the second mold M2. A molding die clamping force Pc2... That yields a quantity Lm (Lmp, Lmr) and that uses the molding injection pressure Pi is obtained, and each molding die clamping force Pc2. M2 is set as a unique molding condition corresponding to each of the subsequent molding dies M2,..., And the main molding is performed by the respective molding dies M1, M2,.

  In this case, according to a preferred aspect of the invention, the parting opening amount Lm (Lmp, Lmr) is calculated from the relative distance between the fixed mold Mc and the movable molds Mm1, Mm2,... Detected by the position detector 4 attached to the fixed mold Mc. Can be obtained. Further, a display 5d attached to the molding machine controller 5 is a setting unit for setting the mold clamping force Pc1, Pc2,... And a plurality of mold clamping force setting units D1, D2,. Can be displayed in the same setting screen Vs. At this time, change graphs Gp, Gv, Gx... Related to one or more operation physical quantities with the horizontal axis Vsgh as a time axis are displayed on the waveform display portion Vsg of the setting screen Vs, and the respective molds M1, M2 are displayed. The change graphs Gp, Gv, Gx for each ... can be selected or the change graphs Gp, Gv, Gx ... for two or more assembled molds M1, M2,. On the other hand, the molding injection pressure Pi and the mold clamping forces Pc1, Pc2,... Are such that a predetermined residual gap Lmr is generated in the molds M1, M2,... After the resin R is filled and the cooling time Tc has elapsed. Can be set. On the other hand, at least the maximum amount Lmp... And / or the minimum amount Lmr... Of each parting opening amount Lm... In each of the molds M1, M2. In the main molding, the mold clamping devices 1c clamp the molds M1, M2,... So that the mold clamping forces Pc1, Pc2,... Set corresponding to the molds M1, M2,. In addition, the resin R can be injected and filled into each mold M1, M2,... From the injection apparatus 1i in which the molding injection pressure Pi is set as the limit pressure Ps.

  According to the molding method of the injection molding machine 1 according to the present invention by such a method, the following remarkable effects are achieved.

  (1) Trial molding of the molds M1, M2,... Is performed, and the obtained mold clamping forces Pc1, Pc2,... Are set as unique molding conditions of the molds M1, M2,. The number of molding conditions is substantially one for each mold M1, M2,. That is, since it is sufficient to set the molding injection pressure Pi and each molding clamping force Pc1, Pc2,..., Accuracy such as multi-stage injection speed, injection pressure (limit pressure), holding pressure, speed pressure switching position, etc. is required. It is not necessary to set various molding conditions including many molding conditions and measurement conditions such as measurement values (measurement start position, measurement end position) that require accurate measurement. Therefore, it is possible to simplify the molding conditions and facilitate and speed up (efficiency) setting work. In addition, the fact that the number of molding conditions is small makes it easy to investigate the cause of any trouble element. That is, even if a normal mold clamping force is set, if the molded product becomes defective, it is possible to easily grasp that the cause is in the mold assembly, and it is possible to realize total management including quality control.

  (2) Even if the state of the molds M1, M2,... And the external environment change as they are used, the mold clamping force Pc1, Pc2,. do not do. That is, even when the density and injection amount of the resin R are slightly changed, a constant molding injection pressure Pi is applied, so that it is not affected by the quantitative error factor of the resin R, and is always constant. Mold quality can be maintained.

  (3) According to a preferred embodiment, if the parting opening Lm is obtained from the relative distance between the fixed mold Mc detected by the position detector 4 attached to the fixed mold Mc and the movable molds Mm1, Mm2,. Since the magnitude of the parting opening amount Lm can be directly detected, it is possible to obtain accurate parting opening amount Lm, and further change data thereof, by eliminating error factors other than the position detector 4 as much as possible.

  (4) According to a preferred embodiment, a plurality of mold clamping force setting units D1, D2,..., Which are setting units for setting the molding mold clamping forces Pc1, Pc2,. Even when displayed in the same setting screen Vs of the display 5d attached to the mold 5, the mold clamping force setting units D1, D2,... For setting the molding conditions are substantially the mold clamping forces Pc1, Pc2,. Since only setting is necessary and only one setting key is required for one assembled mold M1..., For example, an existing setting screen used in a general injection molding machine having a single mold is used, It is possible to easily construct the molding condition setting screen Vs such that the mold clamping force setting sections D1, D2,... Can be displayed without difficulty in the empty space.

  (5) According to a preferred embodiment, the waveform display section Vsg on the setting screen Vs displays change graphs Gp, Gv, Gx... Related to one or more operating physical quantities with the horizontal axis Vsgh as a time axis, If the change graphs Gp, Gv, Gx for each of the molds M1, M2... Are selected, or the change graphs Gp, Gv, Gx. For example, the change of the parting opening amount Lm with respect to time can be grasped in comparison with the change of the injection pressure Pd with respect to time, or the data of the respective molds M1, M2,. More accurate monitoring can be performed on change data such as Lm, and fine adjustment for optimizing the molding conditions, that is, the mold clamping forces Pc1, Pc2,.

  (6) According to a preferred embodiment, the molding injection pressure Pi and the mold clamping are performed so that a predetermined residual gap Lmr is generated in the molds M1, M2,... After the resin R is filled and the cooling time Tc has elapsed. If the forces Pc1, Pc2,... Are set, natural compression on the resin R in the cavities of the respective molds M1, M2,.

  (7) According to a preferred embodiment, at least the maximum amount Lmp and / or the minimum amount Lmr for each shot of the parting opening amount Lm in each of the molds M1, M2. By doing so, it is possible to visually check the changing state of the parting opening Lm (Lmp, Lmr)... In each of the assembled molds M1, M2,. The yield rate can be improved and the molding conditions can be set and managed more easily.

  (8) According to a preferred embodiment, in the main molding, each mold M1, Mc1 is set so that the mold clamping force Pc1, Pc2,... Set corresponding to each mold M1, M2,. When the molds M2 are clamped and the resin R is injected and filled into the respective molds M1, M2,... From the injection apparatus 1i in which the molding injection pressure Pi is set as the limit pressure Ps, the respective molds M1, M2 are filled. The molding injection pressure Pi that is always set can be applied to the resin R filled in. As a result, a predetermined mold gap Lm can be generated by the relative force relationship between the fixed mold clamping forces Pc1, Pc2,... And the fixed mold injection pressure Pi, and the injection filling of the resin R is completed. Later, natural compression can be caused by the mold clamping force Pc, and high quality and homogeneity of the molded product 100 can be secured. Therefore, it is optimal for molding a low-viscosity resin R having characteristics that are sensitive to temperature and pressure. In addition, operation control during production can be easily performed, and a series of controls such as multi-stage control for injection speed and control for holding pressure are not required, so that the molding cycle time can be shortened, and mass productivity and It is possible to obtain the basic effect that the economy can be improved.

The flowchart for demonstrating the setting method of the molding conditions used for the molding method of the injection molding machine which concerns on suitable embodiment of this invention, A cross-sectional front view of an injection molding machine including the configuration of a control system used in the molding method, Sectional side view of the same injection molding machine, Block diagram of the control system of the injection molding machine, Setting screen configuration diagram of a display provided in the injection molding machine, Monitor screen configuration diagram of the trend graph on the display provided in the injection molding machine, A data graph showing a quality result of a molded product with respect to a mold clamping force for explaining processing when setting molding conditions used in a molding method of the injection molding machine; Change characteristics diagram of injection pressure, injection speed and mold gap with respect to time during molding of the same injection molding machine, Schematic diagram showing the state of the mold of the injection molding machine, A flowchart for explaining a processing procedure at the time of production of the injection molding machine;

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, a configuration of an injection molding machine 1 suitable for use in carrying out the molding method according to the present embodiment will be described with reference to FIGS.

  The illustrated injection molding machine 1 is a vertical rotary injection molding machine, and the entire structure is shown in FIGS. The injection molding machine 1 includes a machine base 11, and the upper surface of the upper plate portion 11 u of the machine base 11 is a molding machine bed that is flat. On the upper surface of the upper plate portion 11u, a moving plate (rotary plate) 3 having a circular shape in plan view is disposed (placed), and the inside of the machine base 11 and the inner surface of the upper plate portion 11u is rotated. A rotary drive motor 12 is provided in which the output shaft 12s is positioned at the center of the movable board 3. The rotary output shaft 12s penetrates the upper plate portion 11u and is coupled to the center of the movable board 3. Then, two movable types, that is, a first movable type Mm1 and a second movable type Mm2 are attached to the upper surface of the movable board 3 with a positional relationship of 180 [°].

  A fixed platen 2 is disposed above one position of the first movable type Mm1 or the second movable type Mm2 at the stop position of the first movable type Mm1 or the second movable type Mm2. Attaches the fixed type Mc shared by the first moving type Mm1 and the second moving type Mm2. The fixed platen 2 can be moved up and down by a mold clamping device 1c. That is, a clamping cylinder 13 containing a single-rod type drive ram 13d is provided on the inner surface of the upper plate portion 11u, which is vertically below the fixed platen 2, and a rod of the drive ram 13d protruding downward. The drive panel 14 is coupled to 13dr. As shown in FIG. 3, the lower ends of the pair of tie bars 15p and 15q are coupled to the both side positions of the drive panel. The tie bars 15p and 15q penetrate the upper plate portion 11u at a right angle, and the upper ends thereof are coupled to both side positions of the fixed platen 2. At this time, the tie bars 15p and 15q are respectively arranged on the outer positions of the moving board 3, and as shown in FIG. 3, the portion of the upper plate portion 11u through which the tie bars 15p and 15q penetrate is formed by forming a thick wall. The tie bars 15p and 15q are configured as bearing portions 11up and 11uq that translate the tie bars 15p and 15q in a vertical and stable manner.

  As a result, when the mold clamping cylinder 13 is driven and controlled, the drive ram 13d moves up and down, and the fixed platen 2 and the fixed mold Mc that are coupled together move up and down, so that the first movable type Mm1 or the second movable type Mm2 A mold clamping device 1c that performs mold closing operation, mold clamping operation, and mold opening operation is configured. At this time, the mold in which the fixed mold Mc and the first movable mold Mm1 are combined becomes the assembled mold (first mold) M1, and the mold in which the fixed mold Mc and the second movable mold Mm2 are combined is the molded mold. (Second assembly mold) M2. The illustrated mold clamping device 1c uses a mold clamping cylinder (hydraulic cylinder) 13 and is configured as a direct pressure type hydraulic mold clamping device. As the mold clamping device 1c, such a hydraulic mold clamping device causes the fixed mold Mc to be displaced by the injection pressure at the time of injection filling to generate a necessary gap (parting opening amount) Lm (Lmp, Lmr). Ideal for.

  On the other hand, an injection device 1 i is disposed on the upper surface of the fixed platen 2. In this case, a support block 17 erected upward is provided on the upper surface of the fixed platen 2. An injection device advance / retreat cylinder 18 is attached to the support block 17, and the injection device 1i is supported by the injection device advance / retreat cylinder 18 so as to be movable up and down. The injection device 1i includes a heating cylinder 19 incorporating an injection screw, and has an injection nozzle 19n at the front end (lower end) of the heating cylinder 19, and an injection cylinder that moves the injection screw forward and backward at the rear end of the heating cylinder 19. 20 and an oil motor (not shown) for rotating the injection screw.

  Accordingly, when the injection device advance / retreat cylinder 18 is driven and controlled, and the injection device 1i is lowered, a nozzle touch operation for bringing the injection nozzle 19n into contact with the fixed mold Mc is performed, and when the injection device 1i is raised, FIG. As shown, the injection nozzle 19n is separated from the fixed mold Mc. Further, if the oil screw (not shown) is driven and rotated to rotate the injection screw, the resin R can be plasticized and melted, and the injection cylinder 20 is driven and controlled to move the injection screw in the heating cylinder 19 forward. By doing so, it is possible to inject the resin R from the injection nozzle 19n and fill the assembled molds M1 and M2.

  On the other hand, reference numeral 21 denotes a hydraulic circuit, which includes a variable discharge hydraulic pump 22 and a valve circuit 23 serving as a hydraulic drive source. As shown in FIG. 4, the hydraulic pump 22 includes a pump unit 24 and a servo motor 25 that rotationally drives the pump unit 24. Reference numeral 25e denotes a rotary encoder that detects the rotational speed of the servo motor 25. The pump unit 24 incorporates a pump body 26 constituted by a swash plate type piston pump. Therefore, the pump unit 24 includes the swash plate 27. If the inclination angle (swash plate angle) of the swash plate 27 is increased, the stroke of the pump piston in the pump body 26 increases, the discharge flow rate increases, and the swash plate increases. If the angle is made smaller, the stroke of the pump piston becomes smaller and the discharge flow rate decreases. Therefore, by setting the swash plate angle to a predetermined angle, a fixed discharge flow rate at which the discharge flow rate (maximum capacity) is fixed to a predetermined size can be set. A control cylinder 28 and a return spring 29 are attached to the swash plate 27, and the control cylinder 28 is connected to a discharge port of the pump body 26 through a switching valve (electromagnetic valve) 30. Thus, the angle of the swash plate 27 (swash plate angle) can be changed by controlling the control cylinder 28.

  In addition, the suction port of the pump unit 24 is connected to the oil tank 31, and the discharge port of the pump unit 24 is connected to the primary side of the valve circuit 23. Further, the secondary side of the valve circuit 23 is connected to the injection cylinder 20, the injection device advance / retreat cylinder 18 and the oil motor in the injection device 1i of the injection molding machine 1, and the mold clamping cylinder 13 in the mold clamping device 1c and the illustration are omitted. Connect to the protruding cylinder. Therefore, the valve circuit 23 includes a switching valve (electromagnetic valve) connected to the injection cylinder 20, the mold clamping cylinder 13, the injection device moving cylinder 18, the oil motor, and the protruding cylinder. Each switching valve is composed of one or two or more valve parts and necessary accessory hydraulic parts, etc., and at least the injection cylinder 20, the mold clamping cylinder 13, the injection device moving cylinder 18, the oil motor, and the protruding cylinder. Has a switching function for supplying, stopping, and discharging hydraulic oil.

  Thereby, if the rotational speed of the servo motor 25 is variably controlled, the discharge flow rate and the discharge pressure of the variable discharge hydraulic pump 22 can be varied, and based on this, the above-described injection cylinder 20, mold clamping cylinder 13, injection device movement Drive control for the cylinder 18, the oil motor, and the protruding cylinder can be performed, and each operation process in the molding cycle can be controlled. In this way, if the variable discharge hydraulic pump 22 capable of setting the fixed discharge flow rate by changing the swash plate angle is used, the pump capacity can be set to a fixed discharge flow rate (maximum capacity) of a predetermined size and the fixed discharge flow rate can be set. Since the discharge flow rate and the discharge pressure can be varied based on the flow rate, the control by the control system can be carried out easily and smoothly.

  Further, 5 is a molding machine controller which constitutes a main part of the control system, and a display 5d is attached. As shown in FIG. 4, the molding machine controller 5 includes a servo circuit 51, and the servo motor 25 described above is connected to the output section of the servo circuit 51, and the encoder pulse input section of the servo circuit 51 has a rotary circuit. Connect the encoder 25e. Further, the valve circuit 23 described above is connected to a control signal output port of the molding machine controller 5.

  On the other hand, the position detector (gap sensor) 4 is fixed to the outer surface of the fixed mold Mc. The position detector 4 has a function of detecting the relative position of each of the movable types Mm1, Mm2 and the fixed type Mc, that is, the size of the parting opening Lm. As shown in FIG. A reflective distance measuring sensor that projects light or radio waves onto the reflector 52 attached to Mm2 for distance measurement can be used. In this way, if the parting opening Lm is obtained from the relative distance between the fixed mold Mc detected by the position detector 4 attached to the fixed mold Mc and the movable molds Mm1 and Mm2, the parting opening Lm Since the size can be directly detected, there is an advantage that an accurate parting opening amount Lm in which error factors other than the position detector 4 are eliminated as much as possible, and further, change data thereof can be obtained. Further, a pressure sensor 53 for detecting hydraulic pressure is attached to the primary side of the valve circuit 23 in the hydraulic circuit 21. At this time, a temperature sensor for detecting the oil temperature and correcting the detection value of the pressure sensor 53 may be provided. The position detector 4 and the pressure sensor 53 (and the temperature sensor) are connected to the sensor port of the molding machine controller 5.

  FIG. 4 shows a block system of the molding machine controller 5 (control system). The molding machine controller 5 includes a controller body 5m and the servo circuit 51 described above. The controller main body 5m has a computer function incorporating hardware such as a CPU and an internal memory. Therefore, the internal memory includes a data memory 5md that stores a control program (software) 5mp for executing various arithmetic processes and various control processes (sequence control) and can store various data (databases). In particular, the control program 5mp includes a control program for executing the molding method according to the present embodiment.

  Further, since the injection molding machine 1 performs a molding operation by a specific molding method (specific molding mode), the internal memory includes a control program (sequence control program) for performing the molding operation. In this specific molding mode, trial molding is performed in advance, and at the time of injection filling, a predetermined gap, that is, a parting opening amount Lm occurs between the movable molds Mm1, Mm2 and the fixed mold Mc, and molding injection pressure capable of molding good products. A molding condition setting function for obtaining and setting Pi and mold clamping forces Pc1 and Pc2, and further, during molding (production), the mold clamping device 1c is clamped by the mold clamping forces Pc1 and Pc2, and molding injection is performed. The injection device 1i set with the pressure Pi as the limit pressure Ps is driven to inject and fill the resin R into the molds M1 and M2, and after the injection filling, a predetermined cooling time Tc in the molds M1 and M2 elapses. If it does, it has a molding function to take out the molded product. The injection molding machine 1 also includes a control program (sequence control program) that performs a molding operation using a general-purpose molding method (general-purpose molding mode) that has been widely used conventionally. In the general-purpose molding mode, the molds M1 and M2 are clamped with a predetermined set clamping force, and the resin R is injected and filled into the molds M1 and M2 with a predetermined injection speed and a predetermined injection pressure. Therefore, the specific molding mode and the general-purpose molding mode can be arbitrarily selected.

  On the other hand, the display 5d includes a display body 5dd and a touch panel 5dt attached to the display body 5dd. The display body 5dd and the touch panel 5dt are connected to the controller body 5m via the display interface 55. Therefore, various setting operations and selection operations can be performed by the touch panel 5dt. On this display 5d, a setting screen (injection / metering screen) Vs shown in FIG. 5 and a monitor screen Vm shown in FIG. 6 can be displayed in relation to the present embodiment. As shown in FIG. 5, the injection / metering screen Vs can be displayed by touch-selecting an “injection / metering screen” switching key K3 from a plurality of screen switching keys displayed at the upper and lower stages of the screen. The monitor screen Vm can be displayed by touching the “monitor screen” switching key K5.

  The injection / metering screen Vs includes a molding mode switching key Km. By touching the molding mode switching key Km, the specific molding mode and the general-purpose molding mode can be switched. As shown in FIG. 5, the injection / metering screen Vs includes an injection speed setting unit 61 that performs settings related to the injection speed, an injection pressure setting unit 62 that performs settings related to the injection pressure, and a measurement setting unit 63 that performs settings related to measurement. , An auxiliary setting unit 64 for performing other settings and display is provided. In this case, each of these setting sections 61, 62, 63, 64 is used for both the specific molding mode and the general-purpose molding mode.

  Further, on the injection / metering screen Vs, as shown in FIG. 8, the parting opening amount Lm from at least after the resin filling start ts to the molds M1, M2 until the cooling time end te of the molds M1, M2 A waveform display portion Vsg for displaying the change data. This waveform display portion Vsg displays change graphs Gp, Gv, Gx... Related to one or more operation physical quantities with the horizontal axis Vsgh as a time [second] axis, and for each of the molds M1, M2. The change graphs Gp, Gv, Gx are selected, or the change graphs Gp, Gv, Gx,... In this case, the change graph Gp is the injection pressure Pi [MPa], the change graph Gv is the injection speed Vi [mm / s], and the change graph Gx is the parting opening Lm [mm]. In particular, the time [sec] on the horizontal axis Vsgh ensures at least a time length capable of plotting the time from the resin filling start ts to the molds M1 and M2 until the cooling time end te of the molds M1 and M2. For this reason, three time setting units 65, 66, and 67 are provided below the waveform display unit Vsg. Further, the waveform display portion Vsg is provided with a mold selection key 68. With the mold selection key 68, a change graph Gp for each of the molds M1 and M2 is displayed for the waveform displayed on the waveform display Vsg. Gv, Gx can be selected and displayed, or change graphs Gp, Gv, Gx... Of two or more assembled molds M1, M2 can be superimposed and displayed.

  In this way, on the waveform display section Vsg on the setting screen Vs, the change graphs Gp, Gv, Gx... Related to one or more operation physical quantities with the horizontal axis Vsgh as the time axis are displayed, and each mold M1, M1 is displayed. If the change graphs Gp, Gv, Gx for each M2 are selected or the change graphs Gp, Gv, Gx... For the change data such as the parting opening amount Lm, the change of the amount Lm with time can be grasped in comparison with the change of the injection pressure Pd with time, and the data of each mold M1, M2 can be compared and observed. Thus, more accurate monitoring can be performed, and fine adjustment for optimizing the molding conditions, that is, the molding mold clamping forces Pc1 and Pc2 to be set can be easily performed.

  Further, as shown in FIG. 5, two mold clamping force setting parts D1, D2 corresponding to the respective molds M1, M2 are independently provided in the same setting screen (injection / metering screen) Vs of the display 5d. indicate. In this way, a plurality of mold clamping force setting units D1, D2 corresponding to the respective molds M1, M2 are set in the same setting screen Vs, which are setting units for setting the molding mold clamping forces Pc1, Pc2. Even if it is displayed, the mold clamping force setting sections D1 and D2 of the molding conditions need only actually set the mold clamping forces Pc1 and Pc2. Therefore, since only one setting key is required for one assembled mold M1,..., For example, an existing setting screen used in a general injection molding machine having a single mold is used and its empty space is used. Thus, the molding condition setting screen Vs can be easily constructed.

  This waveform display portion Vsg is used only in the specific molding mode. Therefore, in the general-purpose molding mode, a display different from the waveform display portion Vsg, that is, a conventionally known general waveform display is performed. As described above, if the specific molding mode and the general-purpose molding mode can be switched and the waveform display portion Vsg can be used only when the specific molding mode is switched, the general-purpose molding mode is not sacrificed. Since it is possible to optimize the specific molding mode, it becomes possible to select a molding method suitable for various molding scenes with different types of molded products and types of molding materials. Can increase added value and merchantability, and can further enhance the user-side usability.

  Next, the molding method of the injection molding machine 1 according to the present embodiment will be specifically described with reference to FIGS.

First, an outline of the molding method will be described.
(A) First, the mold clamping forces Pc1, Pc2 and the molding injection pressure Pi used during production are obtained and set as molding conditions. On this occasion,
(X) At the time of injection filling, an appropriate parting opening amount (natural gap) Lm is generated between the fixed mold Mc and the movable molds Mm1 and Mm2.
(Y) Molded products shall not have molding defects such as burrs, sink marks and warps,
As a condition.

Further, the natural gap Lm includes the molding gap Lmp, which is the maximum parting opening amount, and the parting opening amount after the cooling time Tc elapses, when degassing and resin R compression (natural compression) are performed. Considering the residual gap Lmr
(Xa) The forming gap Lmp is 0.03 to 0.30 [mm],
(Xb) The residual gap Lmr is 0.01 to 0.10 [mm],
It is subject to satisfying each tolerance range. Accordingly, the forming gap Lmp is the maximum amount (max) of the parting opening amount Lm, and the residual gap Lmr is the minimum amount (min) of the parting opening amount Lm.
(B) During production, the resin R is simply injected according to the molding conditions of performing mold clamping with the set molding clamping forces Pc1 and Pc2 and setting the molding injection pressure Pi to the limit pressure Ps.

  Therefore, according to such a molding method, the natural gap Lm and the natural compression occur in the molds M1 and M2 at the time of injection filling. As a result, even if the behavior of the resin R injected and filled by the injection device 1i is unstable, the mold clamping device 1c adapts to the unstable behavior of the resin R, and has a high quality and homogeneity. Is obtained.

  Next, a specific processing procedure will be described. First, a molding injection pressure Pi and molding clamping forces Pc1 and Pc2 that are molding conditions are obtained in advance and set as molding conditions. FIG. 1 is a flowchart for explaining a processing procedure for obtaining and setting the molding injection pressure Pi and the mold clamping forces Pc1 and Pc2.

  First, the molding mode is switched to the specific molding mode by the molding mode switching key Km shown in FIG. 5 (step S1). At first, in order to set the first mold M1, the mold clamping force setting portion D1 corresponding to the first mold M1 is touch-selected. As a result, the setting mode for the first mold M1 is set, and when the first movable mold Mm1 is not set below the fixed mold Mc, the rotation drive motor 12 is controlled, and the movable platen 3 rotates. Then, the first moving mold Mm1 moves below the fixed mold Mc (step S2).

  Then, the injection pressure that is the injection condition on the injection device 1i side is initialized by the injection pressure setting unit 62 (step S3). The injection pressure at this time does not need to be accurately set as an absolute value, and can be set based on the capability (driving force) of the injection device 1i. In addition, a mold clamping force as a mold clamping condition on the mold clamping device 1c side is initially set by using the mold clamping force setting unit D1 described above (step S4). The mold clamping force at this time does not need to be accurately set as an absolute value, and the mold clamping force based on the capability (driving force) of the mold clamping device 1c can be set.

  Next, the molding injection pressure Pi used during production is obtained by performing an optimization process for the initially set injection pressure, and the molding die clamping force Pc1 used during production is obtained by performing the optimization process for the initially set mold clamping force. (Steps S5 and S6). An example of a method for optimizing the mold clamping force and the injection pressure will be described with reference to FIG.

  First, trial molding is performed using the initially set clamping force and injection pressure. By pressing the molding start button, a mold clamping operation is performed, and trial molding with the first assembled mold M1 is performed under the initially set conditions. In the example, the initially set clamping force is 40 [kN]. FIG. 7 shows the result of trial molding using the initially set clamping force (40 [kN]) and injection pressure. In this case, both the forming gap Lmp and the residual gap Lmr are 0. In addition, since the mold clamping force is large in the initial setting, it is level 0 (best) that does not generate burrs, level 4 (defective) for sink marks, level 3 (bad) for warpage, and level 3 for degassing. It shows that it became (defect).

  Further, as shown in FIG. 7, the size of the mold clamping force and the injection pressure are lowered step by step, and trial molding is performed at each step, whereby a party between the fixed die Mc and the movable die Mm1 is obtained. The opening amount Lm (Lmp, Lmr) is measured and the quality state of the molded product is observed (steps S7 and S8). Although there is no injection pressure data in FIG. 7, the optimization of the injection pressure is based on the condition that a parting opening Lm occurs between the movable mold Mm1 and the fixed mold Mc at the time of injection filling, and good product molding becomes possible. In addition, the minimum value that can be set or a value in the vicinity thereof can be used as the molding injection pressure Pi. Specifically, as shown in FIG. 7, when the mold clamping force is changed (decreased), the injection pressure is also changed (decreased) as appropriate, and the resin R becomes normal with respect to the first mold M1. It is possible to select a size in front of which the filling is not performed. If such a minimum value or a value in the vicinity thereof is selected as the molding injection pressure Pi, the mold clamping force Pc1 can be set to the minimum value or a value in the vicinity thereof accordingly. It is possible to obtain optimum performance from the viewpoint of enhancing, and to protect mechanical parts and the like and to prolong the service life. The determined molding injection pressure Pi is set as a limiter pressure Ps with respect to the injection pressure during production (step S9).

  From the results shown in FIG. 7, when the clamping force is 14, 15, 16 [kN] surrounded by the virtual line frame Zu, both the forming gap Lmp and the residual gap Lmr satisfy the allowable range. That is, the forming gap Lmp satisfies the allowable range of 0.03 to 0.30 [mm], and further satisfies the allowable range of 0.03 to 0.20 [mm]. The residual gap Lmr also satisfies an allowable range of 0.01 to 0.10 [mm], and further an allowable range of 0.01 to 0.04 [mm]. In addition, it is level 0 (best) in which neither burrs, sink marks, nor warp is generated, and degassing is also level 0 (best), which satisfies the condition of obtaining a good molded product. Therefore, the mold clamping force Pc1 can be selected from three mold clamping forces 14, 15, and 16 [kN]. The selected mold clamping force is set as a molding mold clamping force Pc1 when performing mold clamping with the first mold M1 during production (step S10).

  Incidentally, in the case of FIG. 7, the forming gap Lmp satisfies the allowable range of 0.03 to 0.20 [mm], and the residual gap Lmr satisfies the allowable range of 0.01 to 0.04 [mm]. However, the burr can be removed after taking out the molded product and may be used as a good product even if there is a small amount of burr. The occurrence of a low degree of burr as indicated by 1 (good) or level 2 (normal) does not immediately result in a defective product. Therefore, in consideration of the data shown in FIG. 7, it is possible to select the clamping force 12, 13 [kN] surrounded by the virtual line frame Zus depending on the type of the molded product. That is, if the forming gap Lmp satisfies the allowable range of 0.03 to 0.30 [mm] and the residual gap Lmr satisfies the allowable range of 0.01 to 0.10 [mm], a good molded product is obtained. Can be obtained.

  FIG. 7 is explanatory data for setting the mold clamping force Pc1 and the molding injection pressure Pi. Therefore, in the actual setting, for example, the target mold clamping force Pc1 and the molding injection pressure Pi are obtained by changing the mold clamping force several times, such as 40, 30, 20, 10, and the like. it can. Further, the magnitude of the mold clamping force and the injection pressure may be arbitrarily set by the operator, or may be obtained automatically or semi-automatically while using an auto tuning function provided in the injection molding machine 1 together. When the auto-tuning function is used, the mold clamping force immediately before the occurrence of burrs can be easily obtained.

  Further, a speed limit value VL for the injection speed Vd of the injection device 1i is set (step S11). This speed limit value VL is not necessarily set. However, even if the injection speed Vd becomes excessively high by setting the speed limit value VL, it is mechanically protected against the mold M1,. Can be achieved. Therefore, the speed limit value VL is set to a size that can provide mechanical protection to the molds M1,. If there are other necessary items, they are set (step S12). Thus, the setting of the mold clamping force Pc1, which is the molding condition for the first assembled mold M1, is completed.

  Next, the mold clamping force Pc2 for the second mold M2 is set. At this time, first, the mold clamping force setting part D2 shown in FIG. 5 is touch-selected (steps S13 and S14). Thereby, it switches to the setting mode with respect to the 2nd metal mold M2. Then, by controlling the rotation drive motor 12, the moving plate 3 rotates 180 [°], the first moving type Mm1 and the second moving type Mm2 are switched, and the second moving type Mm2 is located below the fixed type Mc. It is set (step S15). Regarding the injection pressure and mold clamping force to be set, since the injection pressure that is the injection condition on the injection apparatus 1i side has already been set as the molding injection pressure Pi, the injection pressure applied is the set molding injection pressure Pi. Since the setting of the mold clamping force Pc1 for the first assembled mold M1 has already been completed, the mold clamping force can be temporarily set using this mold clamping force Pc1 (step S16). ). That is, since the basic structures of the molds M1 and M2 are the same, the mold clamping force Pc2 for the second mold M2 may be before or after the magnitude of the mold clamping force Pc1. is assumed. Therefore, a value obtained by adding a preset margin clamping force, for example, a fixed value of 5 [kN], to the magnitude of the molding clamping force Pc1 can be temporarily set as an initial value of the clamping force. . Of course, it is possible to set an arbitrary mold clamping force as in the case of the first assembled mold M1.

  Then, using the molding injection pressure Pi and the temporarily set mold clamping force, trial molding is performed in the same manner as in the case of the first mold M1, and the mold used at the time of production is performed by performing optimization processing on the mold clamping force. A tightening force Pc2 is obtained (step S6). That is, as shown in FIG. 7, the size of the mold clamping force is decreased stepwise, and by performing trial molding at each step, the parting opening Lm (Lmp (Lmp) between the fixed mold Mc and the movable mold Mm2 is achieved. , Lmr) and the quality of the molded product is observed (steps S7 and S8). If the mold clamping force satisfies a condition that can be selected as the mold clamping force Mm2, the mold clamping force is set as a mold clamping force Pc2 when clamping with the second mold M2 during production. (Step S10). Note that the optimization process for the injection pressure is not performed. If there are other necessary items, they are set (step S12). Thus, the setting of the mold clamping force Pc2 that is the molding condition for the second assembled mold M2 is completed. In the example, since there are two movable molds Mm1 and Mm2, the setting of all molding conditions is completed as described above.

  Thus, according to the molding method of the injection molding machine 1 according to the present embodiment, trial molding of the molds M1 and M2 is performed, and the obtained mold clamping forces Pc1 and Pc2 are used as the molds M1 and M2. Therefore, the number of molding conditions to be set is substantially one in each mold M1, M2. That is, since it is sufficient to set the molding injection pressure Pi and the mold clamping forces Pc1 and Pc2, there are many demands for accuracy such as multi-stage injection speed, injection pressure (limit pressure), holding pressure, and speed pressure switching position. It is not necessary to set various molding conditions including measurement conditions such as measurement values such as measurement values (measurement start position, measurement end position) that require accurate measurement. Therefore, it is possible to simplify the molding conditions and facilitate and speed up (efficiency) setting work. In addition, the fact that the number of molding conditions is small makes it easy to investigate the cause of any trouble element. In other words, even if a normal mold clamping force is set, if a molded product becomes defective, it can be easily grasped that the cause is in the mold, so that total management including quality control can be facilitated. it can. Further, even when the state of the molds M1 and M2 and the external environment change as they are used, since the mold clamping forces Pc1 and Pc2 are set as molding conditions, the changed error factors are not affected. That is, even when the density and injection amount of the resin R are slightly changed, a constant molding injection pressure Pi is applied, so that it is not affected by the quantitative error factor of the resin R, and is always constant. Mold quality can be maintained.

  Next, a processing procedure during production (main molding) using the molding conditions (mold clamping forces Pc1, Pc2) set in this way will be described. FIG. 10 shows a flowchart for explaining a processing procedure during production using the molding injection pressure Pi and the mold clamping forces Pc1 and Pc2.

  First, by switching the valve circuit 23 and controlling the servo motor 25, the injection screw of the injection device 1i is rotated to plasticize and melt the resin R (step S21). Note that, as described above, this molding method is not affected by the quantitative error factor of the resin R. Therefore, unlike the general molding method, a measuring operation for accurately measuring the resin R is not necessary. Next, by switching the valve circuit 23 and controlling the servo motor 25, the mold clamping cylinder 13 of the mold clamping device 1c is driven, so that the mold clamping force becomes the molding mold clamping force Pc1. The mold is clamped (step S22). FIG. 9A shows the state of the first mold M1 at this time.

  Next, by switching the valve circuit 23 and controlling the servo motor 25, the injection cylinder 20 of the injection device 1i is driven to advance the injection screw, whereby the resin R is injected from the injection start time ts shown in FIG. Step S23). In this case, the injection screw may be advanced by rated operation, and speed control for the injection screw is unnecessary. As a result, the plasticized and melted resin R in the heating cylinder 19 is filled into the cavity of the first assembled mold M1 (step S24). As the resin R is filled, the injection pressure Pd increases as shown in FIG. When the limit pressure Ps is approached and reaches the limit pressure Ps, control for maintaining the limit pressure Ps, that is, control for preventing overshoot is performed, and the injection pressure Pd is the limit pressure Ps (molded injection pressure Pi). (Steps S25 and S26). Therefore, substantial one-pressure control is performed in the injection operation. In FIG. 8, Vd indicates the injection speed.

  Further, when the cavity of the first mold M1 is filled with the resin R, the first mold M1 is pressed against the resin R, and a mold gap Lm is generated between the fixed mold Mc and the movable mold Mm1. At the same time, a molding gap Lmp is generated at the maximum (step S27). The molding gap Lmp is within a permissible range of 0.03 to 0.30 [mm], preferably 0.03 to 0.20 [mm], depending on a preset mold clamping force Pc1 and molding injection pressure Pi. Within the range, good degassing is performed, and good product molding in which defects are eliminated is performed. FIG. 9B and FIG. 3 show the state of the first mold M1 at this time. On the other hand, the solidification of the resin R in the cavity of the first assembled mold M1 proceeds with time, and the compression (natural compression) of the resin R is performed along with the solidification (step S28).

  When the set cooling time Tc elapses, the mold clamping cylinder 13 is driven by the switching of the valve circuit 23 and the control of the servo motor 25 to raise the fixed platen 2 (fixed mold Mc) to open the mold. At the same time, the molded product 100 is ejected (released) by a projecting cylinder (not shown) (steps S29 and S30). Next, by controlling the rotation drive motor 12, the moving board 3 rotates 180 [deg.], And the first moving type Mm1 and the second moving type Mm2 are switched (step S31). Thereby, molding by the second mold M2 in which the fixed mold Mc and the second movable mold Mm2 are combined becomes possible. On the other hand, since the first movable mold Mm1 to which the molded product 100 is attached moves to a position away from the mold clamping device 1c, the operator can take out the molded product 100 from the first movable mold Mm1 (step S32). The cooling time Tc can be set in advance as an elapsed time from the injection start time ts. Further, as shown in FIG. 8, at the time point te when the cooling time Tc has elapsed, due to the natural compression of the resin R, the residual gap Lmr between the fixed mold Mc and the first movable mold Mm1 becomes a preset mold clamping force Pc1. And a molding injection pressure Pi, an allowable range of 0.01 to 0.10 [mm], and preferably an allowable range of 0.01 to 0.04 [mm], and natural to the resin R in the cavity of the mold 2 The compression is reliably performed, and a high degree of quality and homogeneity in the molded product 100 is ensured. The state of the mold 2 at this time is shown in FIG.

  On the other hand, by switching the valve circuit 23 and controlling the servo motor 25, the mold clamping cylinder 13 of the mold clamping device 1c is driven, and the mold clamping force becomes the molding mold clamping force Pc2. Clamping is performed (steps S33, S21, S22). Next, by switching the valve circuit 23 and controlling the servo motor 25, the injection cylinder 20 of the injection device 1i is driven and the injection screw is advanced to inject the resin R. A molding process (molding process) similar to the molding process in the mold M1 is performed (steps S23 to S32).

  Therefore, according to the molding method by such a specific molding method (specific molding mode), in the main molding, the mold clamping force Pc1, set corresponding to each assembled mold M1, M2 by the mold clamping device 1c. The molds M1 and M2 are clamped so as to be Pc2, and the resin R is injected and filled into the molds M1 and M2 from the injection apparatus 1i in which the molding injection pressure Pi is set as the limit pressure Ps. The set molding injection pressure Pi can always be applied to the resin R filled in the respective molds M1 and M2. As a result, the predetermined mold gap Lm can be generated by the relative force relationship between the fixed mold clamping forces Pc1 and Pc2 and the fixed mold injection pressure Pi, and even after the injection filling of the resin R is completed. Natural compression due to the mold clamping force Pc can be generated, and high quality and homogeneity of the molded product 100 can be secured. Therefore, it is optimal for molding a low-viscosity resin R having characteristics that are sensitive to temperature and pressure. In addition, operation control during production can be easily performed, and a series of controls such as multi-stage control for injection speed and control for holding pressure are not required, so that the molding cycle time can be shortened, and mass productivity and The basic effect is that the economy can be improved.

  By the way, at the time of molding, the monitor screen Vm shown in FIG. 6 can be displayed on the display 5d by touch-selecting the “monitor screen” switching key K5 shown in FIG. The monitor screen Vm includes parting opening amount monitor units Vm1 and Vm2 for displaying the parting opening amounts corresponding to the respective molds M1 and M2, and the parting opening amount monitoring units Vm1 and Vm2 include At least the maximum amount Lmp and / or the minimum amount Lmr for each shot of the parting opening amount Lm in each of the molds M1, M2 is displayed in time series by the trend graph GT. Note that the time of molding includes both the trial molding and the main molding described above.

  In this way, if at least the maximum amount Lmp and / or the minimum amount Lmr for each shot of the parting opening amount Lm in each of the molds M1 and M2 is displayed in time series by the trend graph GT, Since the change status of the parting opening Lm (Lmp, Lmr) in the molds M1 and M2 can be visually confirmed, it can be monitored easily and effectively, and the molding quality and the yield rate can be improved and the molding can be performed. It can also contribute to further ease of setting and managing conditions.

  The preferred embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, shape, quantity, technique, and the like are within the scope not departing from the gist of the present invention. , Can be changed, added and deleted arbitrarily.

  For example, although the reflective distance measuring sensor has been exemplified as the position detector 4, various sensors that can detect a non-contact gap and the like with high accuracy such as a proximity sensor can be used. Further, it is desirable to generate a predetermined residual gap Lmr between the movable molds Mm1, Mm2 and the fixed mold Mc after the elapse of the cooling time Tc, but this does not exclude the case where the residual gap Lmr is not generated. Furthermore, although the case where the direct pressure type hydraulic mold clamping device is used as the injection molding machine 1, a toggle type electric mold clamping device may be used. In this case, if mold clamping is performed with the toggle link mechanism in the unlocked state, natural compression is possible even with the toggle type mold clamping device 1c that cannot realize natural compression in the original use mode. The molding by this molding method (specific molding mode) can be realized in the same manner as when a direct pressure hydraulic clamping device is used. In addition, the allowable range of 0.03 to 0.30 [mm] is exemplified as the forming gap Lmp, and the allowable range of 0.01 to 0.10 [mm] is illustrated as the residual gap Lmr. It is not limited and can be changed according to the type of new resin R and the like. The molding injection pressure Pi is desirably set to a minimum value at which good product molding is possible or a value in the vicinity thereof, but does not exclude cases other than such a minimum value or a value in the vicinity thereof. On the other hand, the fixed type Mc provided on the fixed platen 2 is shown as being one, but can be applied to a plurality of cases. Furthermore, although the number of the mobile Mm1 and Mm2 provided on the moving board 3 is two, the same can be implemented even if there are three or more. In addition, although the plurality of mobile types Mm1, Mm2,... Are the same, they may be different from each other. On the other hand, a plurality of mold clamping force setting units D1, D2,... Corresponding to the respective molds M1, M2,... Are displayed in the same setting screen Vs, but are not limited to this display mode.

  The molding method according to the present invention is an example of a vertical rotary injection molding machine that performs molding using a mold in which a fixed mold provided on a fixed plate and a plurality of movable molds provided on a moving plate are sequentially combined. First, it can be used for various injection molding machines such as a slide type injection molding machine.

  1: injection molding machine, 1c: mold clamping device, 1i: injection device, 2: fixed plate, 3: moving plate, 4: position detector, 5: molding machine controller, 5d: display, Mc: fixed die, Mm1: Moving mold (first moving mold), Mm2: Moving mold (second moving mold), M1: Assembly mold (first assembly mold), M2 ...: Assembly mold (second assembly mold), R : Resin, Lm (Lmp, Lmr): Predetermined gap (parting opening amount), Lmp: maximum amount, Lmr: minimum amount, D1: mold clamping force setting unit, D2: mold clamping force setting unit, Vs: setting screen , Vsg: waveform display, Vsgh: horizontal axis, Gp: change graph, Gv: change graph, Gx: change graph, GT: trend graph

Claims (7)

  The mold (molding mold), which is a combination of a fixed mold provided on the stationary platen and a plurality of movable molds provided on the movable board in sequence, is clamped by a mold clamping device and the mold is clamped. A molding method of an injection molding machine that performs molding by injecting and filling resin into the cavity of an injection device, and sequentially performing trial molding with the assembled molds sequentially combined, and trial molding of the first assembled mold Occasionally, a predetermined gap (parting opening amount) occurs in the assembled mold at the time of injection filling, and an injection pressure (molding injection pressure) and a mold clamping force (molding mold clamping force) that can be molded are obtained and obtained. The molding injection pressure is set as the molding condition on the injection device side, and the determined molding clamping force is set as the inherent molding condition of the first mold, while the second mold and subsequent trial molding Sometimes, the parting opening amount occurs in the mold during injection filling, and The molding clamping force capable of forming a good product when the molding injection pressure is used is determined, and the determined molding clamping force is determined for each molding die after the second molding die. A molding method for an injection molding machine, characterized in that a main molding is performed with each mold according to each molding condition set.   2. The molding method of an injection molding machine according to claim 1, wherein the parting opening amount is obtained from a relative distance between the fixed mold and the movable mold detected by a position detector attached to the fixed mold.   The setting unit for setting the mold clamping force, wherein a plurality of mold clamping force setting units corresponding to the respective molds are displayed in the same setting screen of a display attached to the molding machine controller. Item 3. A molding method for an injection molding machine according to Item 1 or 2.   In the waveform display section of the setting screen, a change graph related to one or more operation physical quantities with the horizontal axis as a time axis is displayed, and a change graph for each mold is selected, or two or more sets are selected. 4. The molding method of an injection molding machine according to claim 3, wherein a change graph of the mold can be superimposed and displayed.   The molding injection pressure and the molding clamping force are set so that a predetermined residual gap is generated in the mold after filling with resin and after a cooling time has elapsed. 5. A molding method for an injection molding machine according to any one of 4 above.   The injection according to any one of claims 1 to 5, wherein at least a maximum amount and / or a minimum amount for each shot of the parting opening amount in each of the molds is displayed in a time series by a trend graph. Molding method of molding machine.   In the main molding, each mold is clamped to have the molding clamping force set corresponding to each mold by the mold clamping device, and the molding injection pressure is set as a limit pressure. The molding method for an injection molding machine according to any one of claims 1 to 6, wherein a resin is injected and filled into each mold from an injection device.

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