Molding machine and molding method

Abstract

To preserve a tie bar and a mold of a molding machine by prevention, and automate parallelization quality determination between platens.SOLUTION: A die cast machine 1 includes: a fixed platen 3 provided with a fixed mold 2; a movable platen 5 provided with a movable mold 4; a mold clamping device 20 for performing mold clamping by a tension applied to a tie bar 21; a distortion measurement part 40 for measuring distortion of the tie bar 21 to which the tension is applied; and a control device 30 used in quality determination for the die cast machine 1. The control device 30 includes: a master data registration part 301 for registering master data relating to the measurement value measured by the distortion measurement part 40 in reference time of use change of characteristics of the die cast machine 1 in a predetermined set region; and a quality determination part 302 for determining the quality by comparison of measurement data D1 relating to the measurement value measured by the distortion measurement part 40 with the master data DM after registration of the master data.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to molding machines such as die-casting machines and injection molding machines, a diagnostic program capable of diagnosing changes in the characteristics of the molding machine, and a molding method.

Background Art

[0002] In order to keep a die-casting machine in good condition and operate it normally, for example, at the time of mold clamping completion, the strain due to the elongation of tie bars is measured by a strain gauge, and it is detected that the measured value is within a predetermined normal range. Further, when a foreign object such as a molten metal solidified product adheres to the mold and the movable platen does not reach the predetermined mold clamping completion position within a certain time from the start of mold clamping, it is determined that there is an abnormality in mold clamping and the operation of the machine is stopped. When maintaining a die-casting machine, the distance between the mold mounting surface of the fixed platen and the mold mounting surface of the movable platen in the vicinity of each of the four tie bars is measured, and the parallelism calculated from these distances is compared with a reference value to determine whether it is good or bad.

[0003] Patent Document 1 related to an injection molding machine describes measuring the elongation amount of a tie bar due to the maximum injection pressure and setting a mold clamping force necessary and sufficient to prevent burrs based on the mold opening amount correlated with the elongation amount of the tie bar.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] For example, the following problems exist with respect to the background art described above. (1) When deterioration due to the use of tie bars progresses and wear or damage occurs in the tie bars or bushes, the measured value of the distortion of the tie bars deviates from the normal range. At that time, even if it is possible to detect that an abnormality has occurred in the tie bars, the degree of change over time of the tie bars cannot be known. (2) The parallelism calculated from the platen distance measured using a micrometer near each of the four tie bars requires manual labor and time for distance measurement, parallelism calculation, and pass / fail determination, and it is necessary to stop the die-casting machine to perform the measurement operation of the platen distance. Also, even if it is possible to calculate the parallelism during machine stoppage from the measured distance and perform a pass / fail determination, it is not possible to calculate the parallelism during machine operation and perform a pass / fail determination. (3) In order to detect abnormal clamping due to the adhesion of foreign matter, it takes a certain amount of time to elapse from the start of the clamping process. That is, until the machine stops due to the detection of abnormal clamping, the clamping continues with foreign matter caught between the dies.

[0006] An object of the present invention is to solve the above problems (1) to (3) for molding machines such as die-casting machines and injection molding machines.

Means for Solving the Problems

[0007] The molding machine of the present invention includes a fixed platen provided with a fixed die, a movable platen provided with a movable die, a clamping device that performs clamping by the tension applied to the tie bars, a strain measurement unit that measures the strain of the tie bars to which tension is applied, and a control device used for pass / fail determination related to the molding machine. The control device includes a master data registration unit that registers master data related to the measured value measured by the strain measurement unit at the reference time of the usage change of the characteristics of the molding machine in a predetermined setting area, and a pass / fail determination unit that determines pass / fail by comparing the measurement data related to the measured value measured by the strain measurement unit after the registration of the master data with the master data.

[0008] The "change in use" of a characteristic refers to a change in the characteristic of an object (such as wear or corrosion) caused by continuous or intermittent use of the object over a period of time, or a change in the state of the object due to the passage of time. The "change in use" includes changes over time and changes over years.

[0009] In the molding machine of the present invention, it is preferable that the master data and the measurement data correspond to the strain of the tie bars, and the difference between the master data and the measurement data corresponds to the change in use of the strain.

[0010] In the molding machine of the present invention, it is preferable that the master data registration unit registers master data corresponding to the change curve of the strain from before the occurrence of the strain of the tie bars to the completion of mold clamping in the setting area, and the pass / fail determination unit determines pass / fail by comparing the measurement data with the master data while acquiring measurement data corresponding to the change curve of the strain from before the occurrence of the strain to the completion of mold clamping.

[0011] The molding machine of the present invention includes a plurality of strain measurement units respectively corresponding to a plurality of tie bars included in the mold clamping device, and the master data registration unit registers the measured values obtained by each of the plurality of strain measurement units as master data for each tie bar. It is preferable that the pass / fail determination unit determines pass / fail for each of the plurality of tie bars by comparing the measurement data obtained for each tie bar, which is the measured value obtained by each of the plurality of strain measurement units, with the master data.

[0012] The molding machine of the present invention includes a plurality of strain measurement units respectively corresponding to a plurality of tie bars included in the mold clamping device, and a parallelism pass / fail determination unit that determines the pass / fail of the parallelism derived from the correlation of the measured values obtained by each of the plurality of strain measurement units. The master data registration unit registers the measured values obtained by each of the plurality of strain measurement units as master data for each tie bar, and it is preferable that the parallelism pass / fail determination unit determines the pass / fail of the parallelism by comparing the measurement data obtained for each tie bar, which is the measured value obtained by each of the plurality of strain measurement units, with the master data.

[0013] The molding machine of the present invention includes a plurality of strain measurement units respectively corresponding to a plurality of tie bars included in a clamping device, and a parallelism determination unit that determines whether the parallelism is good or bad based on the correlation of measurement values obtained by each of the plurality of strain measurement units. The parallelism determination unit preferably determines whether the parallelism is good or bad by comparing the parallelism derived from the correlation of the measurement values measured by each of the plurality of strain measurement units with a reference parallelism.

[0014] The molding machine of the present invention includes a clamping abnormality detection unit that detects a clamping abnormality based on the elapsed time from the time before the occurrence of strain to the occurrence of strain indicated by the measurement value obtained by the strain measurement unit. The master data registration unit registers master data corresponding to at least the strain change curve around the time of occurrence of strain in a setting area. The clamping abnormality detection unit detects a clamping abnormality by comparing the elapsed time based on the measurement data corresponding to at least the strain change curve around the time of occurrence of strain with the elapsed time based on the master data. When the clamping abnormality detection unit detects a clamping abnormality, the control device preferably stops the operation of the molding machine.

[0015] The molding machine of the present invention includes a plurality of strain measurement units respectively corresponding to a plurality of tie bars included in a clamping device. The clamping abnormality detection unit preferably compares the elapsed time based on the measurement data with the elapsed time based on the master data for each of the plurality of tie bars.

[0016] In the molding machine of the present invention, a clamping abnormality detection unit that detects a clamping abnormality based on the elapsed time from the time before the occurrence of strain to the occurrence of strain indicated by the measurement value obtained by the strain measurement unit is provided. The clamping abnormality detection unit detects a clamping abnormality by comparing the elapsed time based on the measurement data corresponding to at least the strain change curve around the time of occurrence of strain with a reference elapsed time. When the clamping abnormality detection unit detects a clamping abnormality, the control device preferably stops the operation of the molding machine.

[0017] In the molding machine of the present invention, the master data and the measurement data preferably correspond to the parallelism derived from the measurement values obtained by each of the plurality of strain measurement units, and the difference between the master data and the measurement data preferably corresponds to the change in use of the parallelism.

[0018] In the molding machine of the present invention, the master data and the measurement data correspond to the elapsed time from the time before the occurrence of strain to the occurrence of strain indicated by the measured value by the strain measurement unit. When the measurement data is shorter than the master data, the pass / fail determination unit determines it as "fail", and when the determination result by the pass / fail determination unit is "fail", it is preferable that the control device stops the operation of the molding machine.

[0019] In the molding machine of the present invention, the pass / fail determination unit applies at least two threshold values to the difference between the measurement data and the master data to determine "pass", "fail", and an intermediate state between "pass" and "fail". When the determination result by the pass / fail determination unit is an intermediate state, it is preferable that the control device outputs information or a warning, and when the determination result by the pass / fail determination unit is "fail", the control device stops the operation of the molding machine.

[0020] In the molding machine of the present invention, the control device preferably includes a history data storage unit that stores the difference between the measurement data and the master data or the measurement data as history data corresponding to the molding cycle, and a sound cycle number estimation unit that estimates the number of sound cycles in which the pass determination by the pass / fail determination unit continues based on the change rate of the history data with respect to the number of cycles.

[0021] The molding machine of the present invention preferably corresponds to a die-casting machine used for casting.

[0022] The diagnostic program of the present invention is a diagnostic program capable of diagnosing changes in the characteristics of a molding machine. It includes a master data registration unit that registers master data related to the measured value of the strain of a tie bar to which tension is applied along with the mold clamping operation in a predetermined setting area at the reference time of the change in the characteristics of the molding machine, and a pass / fail determination unit that determines pass / fail by comparing the measurement data related to the measured value of the strain after the registration of the master data with the master data.

[0023] The molding method of the present invention is a molding method using a molding machine. The control device used for determining the quality of the molding machine registers master data related to the measured value of the strain of the tie bar to which tension is applied during the mold clamping operation in a predetermined setting area. It has a master data registration mode, and a molding mode in which the molding machine performs a molding cycle including a step of clamping a fixed mold and a movable mold, a step of supplying a material to an injection device, a step of injecting the material by the injection device toward a cavity formed by the fixed mold and the movable mold, a step of applying pressure to the material filled in the cavity and holding the pressure, a step of opening the fixed mold and the movable mold, and a step of discharging the product. The molding method performs the molding mode after implementing the master data registration mode at the reference time of the change in the characteristics of the molding machine. In the molding mode, the quality is determined by comparing the measurement data related to the measured value of the strain with the master data.

Advantages of the Invention

[0024] According to the present invention, since the degree of change in the use of strain can be grasped by comparing the master data registered at the reference time of the change in use with the measurement data that can be obtained at any time for each molding cycle, it is possible to perform a quality determination based on the degree of change in use from the reference time to the present. Based on the degree of change in use, it is possible to detect early signs of abnormalities due to changes in the use of tie bars, molds, etc., so that the molding machine can be timely shifted to maintenance without causing damage to the tie bars, molds, etc., and the maintenance of the tie bars and molds can be achieved. According to the present invention, in addition to determining the quality related to the strain characteristics of the tie bar, it is also possible to realize the determination of the quality of parallelism derived from the strain and the detection of mold clamping abnormalities based on the timing of the occurrence of the strain of the tie bar. Regarding the maintenance of the mold, it also contributes to the early detection of mold clamping abnormalities based on the timing of the occurrence of the strain.

[0025] The present invention can be applied not only to new machines but also to existing molding machines by introducing a diagnostic program into the control device. That is, after executing the diagnostic program in the control device and registering the master data related to the measured value measured by the strain measurement unit provided on the tie bar in the storage device at the reference time of use change, by comparing the master data read from the storage device with the measurement data related to the measured value measured by the strain measurement unit, the degree of use change can be known and preventive maintenance of the tie bar and the mold can be achieved.

Brief Description of Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 〔Overall Configuration〕 The die-casting machine 1 shown in FIG. 1 includes a fixed platen 3 provided with a fixed mold 2, a movable platen 5 provided with a movable mold 4, a mold clamping device 20 that performs mold clamping by the tension applied to the tie bars 21, an injection device 6 that injects molten metal (material) toward a cavity (not shown) formed by the fixed mold 2 and the movable mold 4, and a control device 30 used for determining the quality of the die-casting machine 1.

[0028] 〔Mold Clamping Device〕 The mold clamping device 20 opens and closes the fixed mold 2 and the movable mold 4 by moving the movable platen 5 along a rail or the like (not shown) in the mold clamping direction x between the fixed platen 3 fixed to the base 7, and clamps the fixed mold 2 and the movable mold 4. This clamping device 20 includes a toggle link 23 installed between a link housing 22 and a movable platen 5, a plurality (typically four) of tie bars 21 arranged parallel to the clamping direction x, a crosshead 24 connected to the toggle link 23, and a clamping cylinder 25 provided in the link housing 22 to drive the crosshead 24. The toggle link 23 includes a mid-link 231 and a crosshead link 232. There are four tie bars 21 in this embodiment, which penetrate through the four corners of the link housing 22, the movable platen 5, and the fixed platen 3 respectively.

[0029] When the crosshead 24 is pushed out toward the movable platen 5 by the clamping cylinder 25 driven by a hydraulic circuit (not shown), the movable platen 5 moves in the clamping direction x toward the fixed platen 3 while being guided by the tie bars 21. At this time, the toggle link 23 (mid-link 231, crosshead link 232) gradually extends from the bent state. As shown in Fig. 2(a), when the movable mold 4 contacts the fixed mold 2, the extension of the tie bar 21 starts, and a strain proportional to the tensile stress occurs in the tie bar 21. The tension of the tie bar 21 is applied to the fixed mold 2 and the movable mold 4 as a clamping force. When the toggle link 23 is extended to the maximum, the tie bar 21 is also extended to the maximum. When the movable mold 4 reaches the position where the clamping is completed, a specified clamping force is applied to the fixed mold 2 and the movable mold 4. With the specified clamping force, the fixed mold 2 and the movable mold 4 can be sufficiently clamped against the pressure of the molten metal in the cavity. By repeating the clamping and mold opening, the strain of the tie bar 21 changes within the elastic range. Note that the clamping device 20 may be an electric type equipped with a motor and a ball screw instead of the clamping cylinder 25.

[0030] 〔Strain measurement unit〕 As shown in Fig. 2(b) and Fig. 3, at the axial ends of the plurality of tie bars 21, strain measurement units 40 for measuring the strain (amount of elongation) of the tie bar 21 to which tension is applied are provided respectively. At the end of the tie bar 21, a nut 27 and a nut retainer 28 are provided. In FIGS. 2, 7, 8, and 10, illustration of the nut 27 and the nut retainer 28 is omitted. Actually, since the nut 27 and the nut retainer 28 are provided at the end of the fixed platen 3 side of the tie bar 21, the end of the tie bar 21 is not exposed.

[0031] As shown in an example of the configuration in FIG. 3, the strain measurement unit 40 includes a rod 41 inserted into a hole 211 drilled in the axial direction on the axis of the tie bar 21, a strain sensor 43 that detects the amount of movement of the end face 41A of the rod 41 due to the elongation of the tie bar 21 as the strain of the tie bar 21, and a spring 44 provided on the rod 41.

[0032] Due to the elastic force of the spring 44, one end of the rod 41 is constantly abutted against the bottom of the hole 211, and the probe 431 of the strain sensor 43 is abutted against the end face 41A of the other end of the rod 41 protruding from the end face 21A of the tie bar 21. The strain sensor 43 is attached to the nut retainer 28 via a bracket 29. When the tie bar 21 extends, the displacement amount of the end face 41A of the rod 41 relative to the tie bar 21 is output from the strain sensor 43 as an electrical signal indicating the strain of the tie bar 21.

[0033] 〔Control Device〕 As shown in an example of the hardware configuration in FIG. 4, the control device 30 includes a control device main body 31, a monitor 32 connected to the control device main body 31, and an external storage medium 33. The control device main body 31 is composed of a computer device or the like, and includes an arithmetic unit 311 such as a CPU (Central Processing Unit), a memory 312, a storage unit 313 (storage medium) that stores data such as programs and set values, and an input / output unit 314.

[0034] A diagnostic program capable of diagnosing changes in the strain characteristics of the tie bar 21 of the molding clamping device 20 is introduced into the control device 30. Based on such a diagnostic program, the control device 30 can diagnose the soundness of the tie bar 21 through measurement of the strain of the tie bar 21.

[0035] If the usage change of the tie bar 21 proceeds without proper maintenance, wear, damage, corrosion, etc. will occur on the tie bar 21 and the bushings etc. associated with the tie bar 21, and the measured value of the distortion of the tie bar 21 will deviate from the normal range. The change in the distortion characteristics of some of the plurality of tie bars 21 can also affect the distortion characteristics of other tie bars 21 provided in the same mold. In addition, the change in the distortion characteristics of some of the tie bars 21 also affects the parallelism.

[0036] When the control device 30 is at the reference time of the usage change of the characteristics of the tie bar 21 and the mold, for example, immediately after the delivery of the die casting machine 1, the measured value by the distortion measurement unit 40 is used as master data (for example, D in FIG. 6) M ) and registered in a predetermined setting area. During casting by the die casting machine 1 after registration, the measurement data of the distortion measured by the distortion measurement unit 40 for each casting cycle (for each shot) (for example, D1 in FIG. 6) is compared with the master data to determine whether it is good or bad. That is, it is determined whether it is good or bad based on the usage change of the distortion from the reference time to the present. In addition to the soundness of the tie bar 21, the control device 30 of the present embodiment also determines whether the parallelism derived from the correlation of the measured values of the distortion of each tie bar 21 is good or bad, and based on the measured value of the distortion, detects abnormal mold clamping caused by foreign matter adhesion to the mold, etc.

[0037] The control device 30 includes, as main control modes, a master data registration mode M1 and a casting mode M2 (molding mode). The master data registration mode M1 registers the master data related to the measured value of the distortion of the tie bar 21 accompanying the mold clamping operation in a predetermined setting area. The casting mode M2 performs a casting cycle including a mold clamping process, a hot water supply process, an injection process, a pressure increase / pressure holding process, a mold opening process, and a product discharge process by the die casting machine 1.

[0038] The diagnostic program introduced into the control device 30 includes, for example, as shown in FIG. 5, a master data registration unit 301, a pass / fail determination unit 302, a notification unit 303, a machine stop unit 304, a parallelism pass / fail determination unit 305, a mold clamping abnormality detection unit 306, a history data storage unit 307, and a sound cycle number estimation unit 308.

[0039] When the control device 30 reaches the reference time of usage change, for example, following the power-on of the control device 30, it executes the master data registration mode M1. By executing the master data registration mode M1, the master data registration unit 301 registers the master data unique to each die-casting machine 1 in the storage unit 313. After the registration of the master data, the casting mode M2 can be executed. In the casting mode M2, for example, when starting the mold clamping process and supplying molten metal to the sleeve 61 of the injection device 6 in parallel with the mold clamping process (molten metal supply process), the plunger 62 coupled to the piston rod 60A of the injection cylinder 60 constituting a hydraulic circuit (not shown) is advanced to inject the molten metal toward the cavity (injection process). When the cavity is filled with the molten metal, the pressure of the molten metal in the cavity is increased to the specified pressure by introducing pressure to the head side 60H of the injection cylinder 60, and the pressure of the molten metal in the cavity is maintained. After the pressure increase and pressure holding process and when the molten metal in the cavity has solidified, the molds 2 and 4 are opened, and the product is discharged from the molds 2 and 4 by a product discharge mechanism (not shown) (mold opening process and product discharge process).

[0040] (Master Data Registration Unit) The master data registration unit 301 registers the measured value measured by the strain measurement unit 40 at the reference time of usage change as master data in a predetermined setting area of the storage unit 313. The "reference time of usage change" corresponds to the initial state of the die-casting machine 1 where there is no substantial usage change in the tie bar 21, molds, etc., such as immediately after the delivery of a newly manufactured die-casting machine 1 or immediately after a test casting performed after delivery.

[0041] When registering master data, the die-casting machine 1 is operated to perform at least the mold clamping process of the casting process, and the measured value of the strain of the tie bar 21 is acquired by the master data registration unit 301. The measured value measured by the strain measurement unit 40, or the average value of the measured values obtained by measuring a plurality of times by the strain measurement unit 40 can be registered as master data.

[0042] Even for the same mold and the same model, due to the individual differences of the die-casting machine 1, the strain of the tie bar 21 is not necessarily the same. Also, the strain of each of the four tie bars 21 is not necessarily the same. The master data is preferably registered individually for each of the plurality of tie bars 21. Also, the behavior and strain of the elongation of the tie bar 21 differ depending on the mold corresponding to the product. Therefore, the master data is preferably registered for each mold.

[0043] When a command to start mold clamping is issued by the control device 30, the movable platen 5 starts to move due to the operation of the mold clamping cylinder 25 and the behavior of the toggle link 23 (mid link 231, crosshead link 232). Thereafter, as shown in FIG. 6 for the strain of the tie bar 21 and the mold clamping stroke by the mold clamping cylinder 25, the strain generated in the tie bar 21 as the elongation of the tie bar 21 starts, the movable platen 5 reaches the mold clamping completion position p f at the mold clamping completion time t f gradually increases until. The mold clamping stroke corresponds to the moving amount of the movable platen 5 driven by the mold clamping cylinder 25. At the start of mold clamping t s , that is, from the time when the command to start mold clamping is issued until the fixed mold 2 and the movable mold 4 come into contact (at the time of strain generation t g ), the elongation amount of the tie bar 21 is substantially 0.

[0044] As shown in FIG. 6, the master data registration unit 301 is, before the time of strain generation t g , for example, from the start of mold clamping t s to the mold clamping completion time t f the master data D corresponding to the strain change curve over MIt is preferable to register this. In this case, the master data D M is composed of a set of continuous measured values measured by the strain measurement unit 40 from the start time t s of mold clamping to the completion time t f of mold clamping.

[0045] The registered master data is basically not updated. The value of the threshold used when determining the quality from the master data and the measurement data can be changed. For example, the threshold can be determined based on the value of the strain measured by the strain measurement unit 40 during regular maintenance. When the deterioration of the tie bar 21 and the molds 2 and 4 progresses and the tie bar 21 and the molds 2 and 4 are replaced with new ones, it is preferable to re-register the master data of the die-casting machine 1 for the new tie bar 21 and molds 2 and 4 by re-executing the master data registration mode M1.

[0046] (Good or Bad Judgment Unit) Any of the processes of the good or bad judgment unit 302, the notification unit 303, the machine stop unit 304, the parallelism good or bad judgment unit 305, the mold clamping abnormality detection unit 306, the history data accumulation unit 307, and the sound cycle number estimation unit 308 described below can be performed while the casting mode M2 is being executed.

[0047] The good or bad judgment unit 302 determines the soundness of the tie bar 21 by comparing the measurement data corresponding to the measured value measured by the strain measurement unit 40 with the master data during casting after the master data is registered. For example, at the completion time t f of mold clamping, the measurement data D1 shown by the dashed line is larger than the master data D M shown by the solid line, so there is a difference in strain, Δη1, between the two. This difference Δη1 corresponds to the change in the use of the strain characteristics of the tie bar 21. In FIG. 6, as shown by the two-dot chain line for the measurement data D2 corresponding to the measured value measured by the strain measurement unit 40 after the measurement data D1, due to the change in the use of the strain characteristics, the difference with respect to the master data D M increases from Δη1 to Δη2. In other words, the master data DM The greater the difference from the measurement data D1 and D2, the greater the degree of usage change.

[0048] Fig. 7(a) shows a comparative example for this embodiment. In the comparative example, master data registration is not performed at the reference time of usage change. Therefore, regardless of the comparison between the master data and the measurement data, at the time t f when the clamping is completed, the upper limit value L1 and the lower limit value L2 of the normal range are applied to the measured value ε f of the strain to determine whether it is good or bad. In this case, if the deterioration of the tie bar 21 progresses and the measured value ε f deviates from the normal range, the strain abnormality of the tie bar 21 can be detected. However, for example, the degree of deterioration of the tie bar 21 immediately after delivery cannot be grasped. Also, if the magnitude of the strain of the tie bar 21 varies immediately after delivery due to individual differences in the die casting machine 1, the upper limit value L1 and the lower limit value L2 are not necessarily appropriate for determining whether it is good or bad.

[0049] According to this embodiment, compared with the comparative example, the degree of usage change of the strain can be grasped by the differences Δη1, Δη2 between the master data registered at the reference time of usage change and the measurement data. Therefore, even if the magnitude of the strain of the tie bar 21 varies immediately after delivery due to individual differences, it is possible to appropriately determine whether it is good or bad based on the degree of usage change indicated by the differences Δη1, Δη2. Based on the degree of usage change indicated by the differences Δη1, Δη2, the remaining service life of the die casting machine 1 is estimated, and maintenance is performed before the expiration date, so that the strain characteristics of the tie bar 21 can be maintained within the normal range without deviating from the normal range.

[0050] The pass / fail determination unit 302 determines whether it is good or bad by applying at least one threshold value to the difference between the master data and the measurement data. For example, if the difference is equal to or less than the threshold value A1, it is determined as "good", and if the difference is greater than the threshold value A1, it is determined as "bad". In this case, if the difference is Δη1, it is determined as "bad". The same applies when the difference is Δη2. Alternatively, by applying two thresholds A1 and A2 to the difference, the pass / fail determination unit 302 can determine "pass", "fail", and an intermediate state ("medium") between "pass" and "fail". For example, since the difference Δε1 is greater than the threshold A1 but smaller than the threshold A2, it is determined to be "medium". Since the difference Δε2 is greater than the threshold A2, it is determined to be "fail".

[0051] Unlike the example shown in FIG. 6, the difference between the measurement data and the master data may decrease with respect to the difference between the previous measurement data and the master data. For example, among the plurality of tires 21, when the strain of any one of the tires 21 increases due to usage change, the strain of the other tires 21 may decrease. Including the case where the difference between the master data and the measurement data decreases, the pass / fail determination unit 302 can determine pass / fail by applying an appropriate threshold to the difference between the master data and the measurement data.

[0052] Based on the pass / fail determination result by the pass / fail determination unit 302, the notification unit 303 and the machine stop unit 304 perform necessary processing. Note that, depending on the pass / fail determination result by the parallelism pass / fail determination unit 305 and the detection result by the mold clamping abnormality detection unit 306, the notification unit 303 and the machine stop unit 304 can also perform necessary processing.

[0053] As described above, before the time t when strain occurs g (at the start time t of mold clamping s ), corresponding to the master data D f that is equivalent to the strain change curve from the start time t of mold clamping to the completion time t of mold clamping M being registered, the pass / fail determination unit 302 preferably acquires, from the start time t of mold clamping s to the completion time t of mold clamping f , measurement data equivalent to the strain change curve by the strain measurement unit 40 in the same manner as the master data. Then, at a certain time from the start time t of mold clamping s to the completion time t of mold clamping f , for example, at the completion time t of mold clamping fOnly the measured values measured at a certain time are registered as master data, different from the case where the pass / fail judgment is made based on the differences Δε1 and Δε2 between the measurement data corresponding only to the measured values measured at the same time and the master data. When the strain of the tie bar 21 occurs at time t g from the time when the strain reaches the maximum value (at the time t f when the mold clamping is completed), the difference between the master data and the measurement data can be monitored over the entire range of the change in strain. In that case, for example, before the movable platen 5 reaches the mold clamping completion position p f , if the difference Δε 11 exceeds a predetermined threshold value, the operation of the die-casting machine 1 can be stopped immediately.

[0054] (Notification unit) The notification unit 303 notifies the result of the pass / fail judgment by the pass / fail judgment unit 302, for example, by displaying information on the screen of the monitor 32 or outputting an alarm sound. For example, when the pass / fail judgment result is "No", the notification unit 303 can issue a warning that the strain of the tie bar 21 is excessive by displaying a message such as "Tie bar strain abnormal". Through such notification, the operator can make arrangements for maintenance of the tie bar 21.

[0055] When "Medium", which is the middle of pass / fail, is included in the pass / fail judgment result, for example, if the pass / fail judgment result is "Medium", it may be displayed as "Tie bar strain caution", and if it is "No", it may be displayed as "Tie bar strain abnormal". According to the notification of "Tie bar strain caution" prior to "Tie bar strain abnormal", it is possible to grasp the degree of deterioration of the tie bar 21 and formulate an appropriate maintenance schedule in consideration of the manufacturing plan of the cast product while the deviation of the measurement data from the master data is minor and the continuous use of the die-casting machine 1 is possible. Note that when the pass / fail judgment result is "Good", the notification unit 303 does not necessarily need to output information or the like.

[0056] (Machine stop unit) When the pass / fail determination result is "fail", a warning or the like is output by the notification unit 303, and if necessary, the operation of the die-casting machine 1 can be stopped based on a machine stop command issued by the machine stop unit 304. Note that when the pass / fail determination result is "fail", the die-casting machine 1 may be stopped by the machine stop unit 304 without notification by the notification unit 303.

[0057] When the pass / fail determination result is "fail", the operation of the die-casting machine 1 may be uniformly stopped by the machine stop unit 304, or the conditions for stopping the die-casting machine 1 may be set by a predetermined threshold value. For example, when the strain due to the elongation of the tie bar 21 is small to the extent that there is a risk of insufficient clamping force, or when the elongations of a plurality of tie bars 21 are unbalanced or a foreign object bites into the molds 2 and 4 and may damage the molds 2 and 4, it is preferable to stop the operation of the die-casting machine 1.

[0058] (Parallelism Pass / Fail Determination Unit) The parallelism pass / fail determination unit 305 determines the pass / fail of the parallelism derived from the correlation of the measurement values obtained by each of the plurality of strain measurement units 40. The parallelism corresponds to the parallelism between the fixed platen 3 and the movable platen 5, or the parallelism between the fixed mold 2 and the movable mold 4.

[0059] For example, as exaggeratedly shown in Fig. 8(a), when the fixed platen 3 is inclined with respect to the movable platen 5, the parallelism is inferior to the case where the fixed platen 3 and the movable platen 5 face each other in parallel as shown in Fig. 2(a). When the parallelism is inferior, the clamping force is not evenly applied to the mating surface 8 between the fixed mold 2 and the movable mold 4, so there is a risk that an excessive load is applied to a part of the mold or burrs are generated on a part of the mating surface 8.

[0060] In the example shown in Fig. 8(a), the fixed platen 3 is inclined with respect to the movable platen 5 in a direction of rotation about the y-axis orthogonal to the mold clamping direction x. However, even when the fixed platen 3 is inclined with respect to the movable platen 5 in a direction of rotation about the z-axis, the parallelism is poor. Further, needless to say, the same applies when the movable platen 5 is inclined with respect to the fixed platen 3.

[0061] In order to control the parallelism within a normal range, in the comparative example shown in Fig. 7(b), with the die-casting machine stopped, the distance X between the mold mounting surface 3A of the fixed platen 3 and the mold mounting surface 5A of the movable platen 5 is measured using a micrometer (not shown) in the vicinity of each tie bar 21. The points B1 to B4 shown in Fig. 7(c) indicate the locations where the distance between the platens 3 and 5 is measured with the micrometer. The parallelism is calculated from the correlation of the distances measured at a total of four locations. By applying, for example, the upper limit value and the lower limit value of the normal range to the parallelism, it is possible to determine whether the parallelism is good or bad.

[0062] In this embodiment, instead of the distance X between the platens 3 and 5, the measured values of the strain of each of the plurality of tie bars 21 passing through the platens 3 and 5 are used. For example, in the example shown in Fig. 8(b), since the elongation of the two tie bars 21 (colored according to the pattern) located above the mold mounting surfaces 3A and 5A is greater than the elongation of the lower tie bars 21, the strain of each of the upper tie bars 21 is also greater than the strain of each of the lower tie bars 21. That is, from the correlation of the strain of each of these tie bars 21, the parallelism determination unit 305 can calculate the parallelism by calculating the measured values of the strain by the strain measurement unit 40 corresponding to each of the tie bars 21.

[0063] The parallelism pass / fail determination unit 305 can determine the pass / fail of the parallelism, for example, by comparing the calculated parallelism with the upper and lower limit values as the reference parallelism. By doing so, compared with the above comparative example, without stopping the die casting machine 1, without spending manpower and time on determining the pass / fail of the parallelism, and without the concern of miscalculating the parallelism due to human error in measurement, the pass / fail of the parallelism can be easily and surely determined. Even during the operation of the die casting machine 1, it is possible to monitor the parallelism based on the measured values by the strain measurement unit 40 at any time and determine the pass / fail.

[0064] As described above, the pass / fail of the parallelism may be determined by comparing the parallelism calculated from the correlation of the measured values of the strains of the respective tie bars 21 with the reference parallelism. However, similar to the pass / fail determination unit 302 described above, it is more preferable for the parallelism pass / fail determination unit 305 to determine the pass / fail of the parallelism by comparing the master data and the measurement data. By doing so, it becomes possible to more appropriately determine the pass / fail of the parallelism in consideration of the individual differences and usage changes of the die casting machine 1.

[0065] FIG. 9(a) shows the master data D corresponding to the strain measurement value for one of the two tie bars 21 colored in FIG. 8(b). M and the measurement data D1 corresponding to the strain measurement value after the master data registration. It is assumed that the master data and the measurement data for the other tie bar 21 are also substantially the same. For the master data D indicated by the dashed line, M the measurement data D1 has shifted to the increasing value side.

[0066] FIG. 9(b) shows the master data D corresponding to the strain measurement value for one of the two non-colored tie bars 21 in FIG. 8(b). M and the measurement data D3 corresponding to the strain measurement value after the master data registration. It is assumed that the master data and the measurement data for the other tie bar 21 are also substantially the same. The measurement data D3 is substantially the same as the master data D. M According to the examples of FIGS. 9(a) and (b), the master data D​M From the reference time when registration is completed until the time when the measurement data D1 and D3 are acquired during mold clamping, due to the passage of time and the continuous use of the die-casting machine 1, the distortion of some of the four tie bars 21 increases from the reference time, and the distortion of the remaining tie bars 21 remains the same as at the reference time. Due to such imbalance in the distortion among the plurality of tie bars 21, the parallelism decreases as shown in the example of FIG. 8(a).

[0067] Therefore, the parallelism determination unit 305 can determine the quality of the parallelism by, for example, applying a predetermined threshold value to the difference (not shown) between the master parallelism calculated from the correlation of the strain measurement values which are master data and the measured parallelism calculated from the correlation of the strain measurement values which are measurement data, through comparison between the two. Note that, in order to obtain the difference in parallelism corresponding to the change in use, it is not premised on the calculation of the master parallelism and the measured parallelism. The difference in parallelism corresponding to the change in use may be calculated from the comparison between the master data for each tie bar 21 corresponding to the strain measurement value of each of the plurality of tie bars 21 and the measurement data for each tie bar 21 corresponding to the strain measurement value of each of the plurality of tie bars 21 as well, that is, from the difference Δη1 etc. of the strain measurement values for each tie bar 21.

[0068] As described above, since the distortion of each of the four tie bars 21 is not necessarily the same even at the reference time when the master data is registered, the parallelism derived from the correlation of the master data is not always perfectly parallel. Also, if the four tie bars 21 extend by the same amount of elongation due to the change in use, the parallelism is maintained. However, as shown in FIGS. 9(a) and (b), the amount of elongation of each tie bar 21 is not necessarily the same. Furthermore, regarding the behavior of each tie bar 21 from the time t g when distortion occurs until the time t f when mold clamping is completed, each tie bar 21 does not necessarily extend evenly.

[0069] However, according to this embodiment, since it is possible to grasp the usage change of the parallelism based on the difference between the master parallelism and the measured parallelism, even if the parallelism varies immediately after incorporation due to individual differences, it is possible to appropriately determine the quality of the parallelism based on the degree of usage change indicated by the difference in parallelism. Based on the determination result by the parallelism quality determination unit 305, it is advisable to output information or warnings by the notification unit 303 or stop the operation of the die casting machine 1 by the machine stop unit 304. By using a plurality of thresholds for the difference in parallelism, for example, the quality can be notified in three or more levels such as "good parallelism", "medium parallelism", and "poor parallelism".

[0070] Master data D M and the measurement data D1 are both obtained by continuous measurement until the mold clamping is completed at time t f Therefore, the difference in parallelism can be monitored based on the strain measurement value over the entire range of strain change. Then, for example, if the difference in parallelism exceeds a predetermined threshold during the movement of the movable platen 5, the operation of the die casting machine 1 can be immediately stopped, so that problems due to deterioration of parallelism, such as excessive load on the molds 2 and 4 or generation of burrs, can be avoided.

[0071] (Mold clamping abnormality detection unit) Next, the mold clamping abnormality detection unit 306 (Fig. 5) will be described with reference to Figs. 10 and 11. The mold clamping abnormality detection unit 306 detects an abnormality in mold clamping based on the elapsed time from a point in time before the strain of the tie bar 21 occurs, for example, at the start of mold clamping at time t s to the occurrence of strain at time t g (t g1 , t gM ) based on the measurement value by the strain measurement unit 40. The occurrence of strain at time t g corresponds to, for example, when the measurement value by the strain measurement unit 40 exceeds a predetermined threshold. The mold clamping abnormality mentioned here mainly assumes the adhesion of foreign matter 9 to the mating surface 8 of the molds 2 and 4 as shown in Figs. 10(a) and (b). The foreign matter 9 corresponds to burrs that are solidified products of the molten metal, solidified products of the release agent, etc.

[0072] Master data D M includes at least a set of measurement values corresponding to a strain change curve over a period before and after the strain generation time t g . The mold clamping abnormality detection unit 306 detects an abnormality in mold clamping by comparing the elapsed time T1 based on the measurement data D1 continuously acquired at least over a period before and after the strain generation time t M after the registration of the master data D with the elapsed time T g based on the master data D M . M

[0073] For the same model, the same mold, and the same tire 21, strain occurs after substantially the same elapsed time from the start time t s of mold clamping. The specified elapsed time T0 required from the start time t s of mold clamping until strain occurs is substantially unchanged with respect to the master elapsed time T M derived from the master data D and is almost constant even if the strain characteristics of the tire 21 change due to use. However, when mold clamping is performed with foreign matter 9 adhering to the mating surface 8 of the fixed mold 2 and the movable mold 4, strain occurs in the tire 21 prior to the specified elapsed time T0 (T M ) by an amount corresponding to the increase in the thickness of the molds 2 and 4 due to the adhesion of the foreign matter 9. The elapsed time T1 from the start time t M of mold clamping to the strain generation time t s at this time is shorter than the specified elapsed time T0 g .

[0074] Therefore, the mold clamping abnormality detection unit 306 derives the master elapsed time T M from the master data D, derives the measured elapsed time T1 from the measurement data D1, and detects a mold clamping abnormality based on the fact that the elapsed time T1 is shorter than the elapsed time T M . M When the mold clamping abnormality detection unit 306 detects an abnormality in mold clamping, the machine stop unit 304 generates a machine stop command to immediately stop the operation of the die casting machine 1. At the same time, it is preferable that the notification unit 303 displays a warning message such as "Mold clamping abnormality, check for foreign objects" on the monitor 32. Note that after the operation of the die casting machine 1 stops, it is preferable to shift to the mold opening operation.

[0075] As a comparative example for the mold clamping abnormality detection unit 306, since the foreign object 9 is caught between the molds 2 and 4, even if the movable platen 5 does not reach the specified mold clamping completion position p f even if it does not reach, at the start of mold clamping t s from the start of mold clamping t f until the mold clamping completion time t

[0076] wait for a fixed time with a margin added to the required assumed time from the start of mold clamping t s to the time t when distortion occurs g until, and if mold clamping abnormality is detected at the end of the wait, stop the operation of the machine. Compared with such a comparative example, according to the present embodiment, the strain measurement unit 40 measures the strain in real time throughout the mold clamping process, and if mold clamping abnormality is detected when the strain occurs, the die casting machine 1 is immediately stopped. Therefore, it is possible to avoid excessive stress from occurring in the molds 2 and 4 by continuing mold clamping with the foreign object 9 sandwiched between the molds 2 and 4, and extend the life of the molds 2 and 4. M and from the measured data D1 for each tie bar 21 to derive the respective elapsed times T M , T1, and by detecting mold clamping abnormality from the difference in the elapsed times T M , T1, even if the foreign object 9 is minute, it is possible to detect the strain that occurred earlier in at least the tie bar 21 closest to the foreign object 9 among the four tie bars 21 than the other tie bars 21. Therefore, it is possible to detect mold clamping abnormality due to the attachment of the foreign object 9.

[0077] According to the clamping abnormality detection unit 306, in addition to the adhesion of the foreign object 9, for example, when the generation of the strain of the tie bar 21 is delayed because the arrival of the movable platen 5 at the clamping completion position p f is hindered by some factor, the clamping abnormality based on the fact that the measured elapsed time T1 is longer than the master elapsed time T M can also be detected.

[0078] Instead of detecting the clamping abnormality by comparing the master data and the measured data as described above, the clamping abnormality detection unit 306 may detect the clamping abnormality by comparing the elapsed time from the start of clamping t s to the occurrence of strain t g with the reference elapsed time. If a clamping abnormality is detected, in order to avoid the generation of excessive stress on the molds 2 and 4, it is advisable to immediately stop the operation of the die-casting machine 1 by the machine stop unit 304.

[0079] (History data storage unit) The history data storage unit 307 stores the difference between the measured data D1 and the master data D M or the measured data D1 in the storage unit 313 as history data corresponding to the casting cycle. The history data can be held in the storage unit 313 as table data in which values are arranged for each tie bar 21 and each mold, for example.

[0080] (Sound cycle number estimation unit) The sound cycle number estimation unit 308 estimates the number of sound cycles in which the "good" determination by the pass / fail determination unit 302 and the parallelism pass / fail determination unit 305 continues based on the change rate of the history data with respect to the number of casting cycles. For example, based on the change rate per unit cycle number of the difference Δε1 at the time when the measured data D1 shown in FIG. 6 is acquired, the number of cycles until the difference between the master data and the measured data exceeds the threshold value A1 can be calculated by arithmetic operation from that time point. Note that the amount of data accumulated by the history data storage unit 307 can be limited to an extent sufficient for calculating the number of sound cycles.

[0081] The number of sound cycles calculated by the sound cycle number estimation unit 308 is preferably displayed on the screen of the monitor 32 by the above-described notification unit 303. Instead of the number of sound cycles, or together with the number of sound cycles, it is also possible to display time information corresponding to the number of sound cycles on the screen of the monitor 32. For example, if information such as "Number of sound cycles: △△△ (about ○○ days)" is notified, it is possible to easily determine the appropriate time for maintenance.

[0082] 〔Main effects according to this embodiment〕 According to the die-casting machine 1, diagnostic program, and casting method of the present embodiment described above, while continuously operating the die-casting machine 1, based on the degree of usage change indicated by the difference between the master data, which is the strain measurement value registered at the reference time of usage change, and the measurement data, which is the strain measurement value acquired during casting, it is possible to determine whether the strain of the tie bar 21 is good or bad. According to this embodiment, in addition to the determination of whether the strain characteristics of the tie bar 21 are good or bad, it is also possible to realize the determination of whether the parallelism that can be calculated from the strain is good or bad, and the detection of mold clamping abnormality based on the timing of strain generation in the mold clamping process.

[0083] If, by the control of the control device 30 based on the diagnostic program, the determination result of whether the strain of the tie bar 21 is good or bad and the determination result of whether the parallelism between the movable platen 5 and the fixed platen 3 is good or bad can be obtained for each shot, it becomes possible to detect early signs of abnormality due to usage changes in the tie bar 21, platens 3, 5, and molds 2, 4. Since the degree of usage change can be grasped by the difference between the master data and the measurement data, it is possible to transfer the die-casting machine 1 to maintenance in a timely manner without damaging the tie bar 21, molds 2, 4, etc., and to maintain the tie bar 21 and molds 2, 4. That is, it is possible to lead to preventive maintenance that prevents troubles related to abnormal strain of the tie bar 21. As a result, the operating rate of the die-casting machine 1 can be increased and productivity can be improved. Regarding the maintenance of the molds 2, 4, as described above, it also contributes to the early detection of mold clamping abnormality by the mold clamping abnormality detection unit 306 compared to the comparative example.

[0084] In addition, this embodiment can be applied not only to newly installed machines but also to existing die-casting machines by introducing a diagnostic program into the control device 30. In this case, it is sufficient to introduce the diagnostic program into the control device 30 without changing the existing systems such as the molds 2 and 4, the mold clamping device 20, the injection device 6, and the hydraulic circuit. Therefore, it is possible to provide a preventive maintenance function based on grasping the degree of change in use while suppressing the cost of equipment introduction. Moreover, since the diagnostic program can automatically perform a pass / fail determination, the work cost can be significantly reduced.

[0085] In addition to the above, as long as the gist of the present invention is not deviated from, it is possible to select and discard the configurations exemplified in the above embodiment, or to appropriately change them to other configurations.

[0086] The present invention can also be applied to injection molding using a resin such as a thermoplastic resin as a material. That is, the present invention applied to the die-casting machine, its diagnostic program, and the casting method in the above embodiment can be similarly applied to an injection molding machine, its diagnostic program, and an injection molding method.

[0087] In the above embodiment, both the master data and the measurement data correspond to the strain of the tie bar 21 measured by the strain measurement unit 40. And when determining the quality of parallelism and detecting mold clamping abnormalities, from the master data and the measurement data corresponding to the strain of the tie bar 21, the parallelism, or the time t s from the start of mold clamping to the time t g when strain occurs is derived. Here, it is not a premise that the measured value of the strain of the tie bar 21 is registered as master data and the master data is compared with the measurement data which is the measured value of the strain of the tie bar 21. For example, the parallelism derived from the correlation of the measured values of the strains of the plurality of tie bars 21 is registered as master data, and the parallelism as measurement data derived from the correlation of the measured values of the strains of the plurality of tie bars 21 is compared with the master data to determine the quality of the parallelism. Similarly, for example, at the start of mold clamping t sFrom the measurement value of the strain of the single or multiple tie bars 21 at the time t when the strain occurs g to the elapsed time T M is registered as master data, and mold clamping abnormalities may be detected by comparing the measurement data corresponding to the elapsed time T1 with the master data in the same way.

[0088] The molding machine, diagnostic program, and molding method of the present invention can be provided with a single or at least two functions among the determination of the quality of the strain of the tie bar 21, the determination of the parallelism between the platens, and the detection of mold clamping abnormalities by the selection of the modules provided in the diagnostic program.

Explanation of symbols

[0089] 1 Die casting machine (molding machine) 2 Fixed mold 3 Fixed platen 3A Mold mounting surface 4 Movable mold 5 Movable platen 5A Mold mounting surface 6 Injection device 7 Base 8 Mating surface 9 Foreign matter 20 Mold clamping device 21 Tie bar 21A End face 22 Link housing 23 Toggle link 24 Crosshead 25 Mold clamping cylinder 27 Nut 28 Nut retainer 29 Bracket 30 Control device 31 Control device main body 32 Monitor 33 External storage medium 40 Strain measurement unit 41 Rod 41A End face 43 Strain sensor 44 Spring 60 Injection cylinder 60A piston rod 60H head side 61 sleeve 62 plunger 211 hole 231 mid-link 232 cross-head link 301 master data registration section 302 pass / fail determination section 303 notification section 304 machine stop section 305 parallelism pass / fail determination section 306 mold clamping abnormality detection section 307 history data storage section 308 sound cycle number estimation section 311 calculation section 312 memory 313 storage section 314 input / output section 431 probe A1, A2 threshold values B1 to B4 points D1, D2, D3 measurement data D M master data L1 upper limit value L2 lower limit value M1 master data registration mode M2 casting mode p f mold clamping completion position T0 specified elapsed time T1, T M elapsed time t s at the start of mold clamping t g , t g1 , t gM when distortion occurs t f at the completion of mold clamping x mold clamping direction Δε1, Δε2, Δε 11 difference ε f measured value X distance

Claims

1. A molding machine comprising: a fixed platen provided with a fixed mold; a movable platen provided with a movable mold; a mold clamping device that performs mold clamping by the tension applied to the tie bars; a strain measurement unit that measures the strain of the tie bars to which the tension is applied; a control device used for determining the quality of the molding machine, wherein the control device includes a master data registration unit that registers master data related to the measured value measured by the strain measurement unit in a predetermined setting area at the reference time of the usage change of the characteristics of the molding machine; a pass / fail determination unit that determines pass / fail by comparing the measurement data related to the measured value measured by the strain measurement unit after the registration of the master data with the master data, comprises a plurality of the strain measurement units respectively corresponding to the plurality of the tie bars included in the mold clamping device, the master data and the measurement data correspond to the parallelism derived from the measured values by the respective plurality of strain measurement units, the difference between the master data and the measurement data corresponds to the usage change of the parallelism, a molding machine.

2. The pass / fail determination unit applies at least two threshold values to the difference between the measurement data and the master data, thereby determining pass, fail, and an intermediate state between the pass and the fail; and the control device outputs information or a warning when the determination result by the pass / fail determination unit is the intermediate state, and stops the operation of the molding machine when the determination result by the pass / fail determination unit is fail. The molding machine according to claim 1.

3. The control device includes a history data storage unit that stores the difference between the measurement data and the master data or the measurement data as history data corresponding to the molding cycle, and a sound cycle number estimation unit that estimates the number of sound cycles in which the pass determination by the pass / fail determination unit continues based on the change rate of the history data with respect to the number of cycles. The molding machine according to claim 1.

4. The master data and the measurement data correspond to the elapsed time from the time point before the occurrence of the strain to the occurrence of the strain indicated by the measured value by the strain measurement unit, and the pass / fail determination unit determines fail when the measurement data is shorter than the master data, and the control device stops the operation of the molding machine when the determination result by the pass / fail determination unit is fail. The molding machine according to claim 1.

5. A molding method using a molding machine, The control device used for the pass / fail determination related to the molding machine is a master data registration mode for registering master data related to the measured values of strain corresponding to each of a plurality of tie bars to which tension is applied with the mold clamping operation in a predetermined setting area, a molding mode including a molding cycle that includes a step of clamping a fixed mold and a movable mold by the molding machine, a step of supplying a material to an injection device, a step of injecting the material by the injection device toward a cavity formed by the fixed mold and the movable mold, a step of applying pressure to and holding the pressure of the material filled in the cavity, a step of opening the fixed mold and the movable mold, and a step of discharging a product, The molding method is performing the molding mode after performing the master data registration mode at the reference time of the usage change of the characteristics of the molding machine, in the molding mode, determining pass / fail by comparing the measurement data related to the measured value of the strain with the master data, the master data and the measurement data correspond to the parallelism derived from the measured value of the strain corresponding to each of the plurality of tie bars, the difference between the master data and the measurement data corresponds to the usage change of the parallelism, a molding method.

Images