JPS6356020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding machine that injects a molten substance into a mold to mold a molded product, such as a die-casting machine or a plastic molding machine, and particularly relates to a device for monitoring various molding processes of the molding machine. Regarding.

A molding cycle for molding one molded product includes a combination of various processes such as an injection process, a measuring process, and a mold opening/closing process.

Hereinafter, for convenience of explanation, a description will be given of a plastic molding machine. Recently, plastic molded products are being used as substitutes for metal machine parts, and plastic molded parts are gradually being used in places that used to use metal parts. Molded products are required to meet incomparably stricter conditions not only in terms of molding dimensions but also in terms of molding quality (strength, durability, chemical resistance, etc.). For example, a large portion of the parts of small precision instruments such as cameras and wristwatches are now made of plastic. Until now, the present inventors have detected the deviation of the pressure when the injection pressure at the transition point of the injection plunger speed is not within the preset tolerance range value in the injection process, and used this as feedback. The control system of the molding machine is operated to reduce the deviation in the next molding cycle. Using this concept, it is easy to determine that molded products that deviate from the above-mentioned tolerance range are defective. Even if a molded product is so simple that it is determined to be a good product, it is found to be a defective product when viewed from the above-mentioned strict inspection standards, and conversely, a molded product that is determined to be a defective product is actually a good product.
These experimental facts show that the factors that affect the shape and dimensions and quality of molded products are complex and diverse, and that changes such as resin temperature, pressure, and injection speed, which change at a certain time or at a certain position of a movable body during the molding process, are complex and diverse. If it is confirmed that a certain physical quantity involved in molding is within the preset tolerance value, it can be determined that the molded product obtained by the molding cycle including that molding process is a good product. This indicates that it is very difficult to determine the time and position in advance, and even if such a time and position were discovered through trial and error, it would be unique to the molded product. It cannot be used immediately for other molded products. Even if the above-mentioned times and positions are set at several more points during the molding process, the difficulty of setting at such several times and positions will not be overcome. It wasn't an improvement. From these experimental facts and with the intention of avoiding the complexity of the inspection process for good and defective products, the present inventors have come to the following conclusion.

That is, in order to meet the above-mentioned strict requirements for molded products, it is necessary to construct a control system for the molding machine that makes it possible. In addition, since defective products may be mixed into molded products, it is necessary to consider what kind of molding process the molded products have undergone.

For example, if we consider the injection process, which is one of the molding processes and is considered to have the greatest effect on the molded product, the injection process involves filling the resin into the mold, followed by a pressure holding process. The history of the patterns of changes in injection pressure or injection speed during the filling process and the pattern of holding pressure during the holding process is used to determine whether the molded product is good or not. It is necessary to take this into account when determining whether a product is defective.

In other words, changes in physical quantities during various molding processes in the cycle of molding a good product are captured in advance as a pattern, and whether the physical quantities continuously detected during the subsequent molding processes approximate the preferred pattern. This means that it is determined whether the product is good or not.

Embodiments of the present invention will be described below with reference to the drawings.
Figure 1 shows the basic configuration of the control system of the injection molding machine 1 in block form. 2 is used for various operation sequence signals of the molding machine 1, for resin injection and metering, temperature control, etc. 3 is an input signal control unit that provides a control signal to the molding machine 1;
This is an output signal control unit that controls sending and receiving of output signals from the system controller 4 to and from the system controller 4. The system controller 4 is a system controller that controls the molding cycle of the molding machine 1 via the above-mentioned input/output control units 2 and 3 in response to commands from each control unit that controls various controls indicated by 8. During the molding cycle, the system controller 4 takes in data from the set value memory 9, and sequentially performs comparisons with logical signals and data taken in from the input/output control units 2 and 3, algebraic operations, and the like. In this case, the type of calculation to be performed is stored in advance in each of the eight control units described above. Further, setting of data in the setting value memory 9 is performed from input means indicated by 6 or 7 via the system controller 4. Further, the contents of the data set in the memory 9 can be output using the output means 7. (Debugging possible) A monitoring unit 5 is located at the lower left of the dotted line, and various physical quantities of the molding machine 1 during the molding cycle are taken into the system controller 4 and given to the monitoring unit 5. The above-mentioned various physical quantities given to the monitoring unit 5 are sent as they are, or after being subjected to certain arithmetic processing operations, to the printer 5-1, recorder 5-2, or display 5.
-3 is becoming more visible.

FIG. 2 is a basic configuration block diagram of a device for monitoring according to the present invention, and 11 indicates physical quantity detection such as temperature, pressure, resin viscosity, and movement speed of movable parts such as injection plungers in each part of the molding machine. In the part, 11-1 is a position signal generating part of the injection plunger, which is one of the above-mentioned physical quantities, and a pulse Px is given for each unit movement of the plunger (for example, 0.01 mm). Reference numeral 12 denotes a clock pulse generator which supplies pulses Pt to the counting signal generator 13 at regular time intervals. Further signal STA
is a start signal of the molding cycle, and is given for each molding cycle by the sequence control section shown in FIG. 18.

The aforementioned counting signal generator 13 generates pulse signals Px,
Counting signals xP, tP where Pt is used as a counting input pulse to the address counter described later
is converted to Reference numeral 14 denotes a switching gate section which switches the count input signals xP and tP to the address counter responsive to the displacement amount x in the addressing section 15 and the address counter responsive to time t.

Reference numeral 15 denotes an address specifying section which specifies addresses in the memory 16, the switching gate section 14, and the allowable width value setting section 18. Reference numeral 17 denotes a comparison/judgment unit in which the difference between the value read from the memory 16 during the molding cycle and the corresponding physical quantity given from the detection unit 11 at that time is determined as the allowable variation range value given by the allowable variation range value setting unit 18. Determine whether or not the value exceeds the specified value.

FIG. 3 shows the allowable fluctuation range value setting section 18, where the amount of displacement x
Each area xo~xa, xa~xb, xb~xc, xc~xd,
It is an explanatory diagram when it is desired to change the permissible fluctuation range value ΔP of the physical quantity P (for example, injection pressure) with respect to xd to xe. In the figure, for example, the permissible variation width value ΔPab of variable x between regions xa to xb and the value ΔPcd between regions xc to xd have a relationship of ΔPab>ΔPcd.

FIG. 4 shows a configuration of the count signal generating section 13 of FIG. 2 using concrete circuit blocks. In the figure, since the upper and lower circuits partitioned by broken lines have the same configuration, the upper counting signal xP generating section 13-A will be explained here.

13-1 is a gate to which the start signal STA and the pulse signal Px from the position signal generator 11-1 are input. When STA=1, the pulse signal Px is applied to the counters 13-2 and 13-3. It will be done. Register group 13-4a, -4b, -4c,
-4d is set with a value (dividing ratio) for dividing the pulse Px, and the counter 13-2
As the counting contents increase, XO, XA, XB, XC
When they match, each comparator 13-5a, -5b, -5
In response to the coincidence signals from c and -5d, the frequency division ratio, which is the numerical value mentioned above, is individually sent to the register 13-7.

The contents of the register 13-7 are set in the counter 13-3 and subtracted by the pulse signal Px.

When the contents of the counter 13-3 count out, the contents of the register 13-7 are set to the counter 13-3 again by the same count-out signal CO. Thereafter, such counting operation is repeated. When the count value of counter 13-2 reaches another switching position, for example from XO to XA, register 13-2
The frequency division ratio set to -4b is now replaced with the previously valid frequency division ratio (set value of 13-4a). Such invalidation signal lines for invalidating, for example, the contents of the register 13-4a and validating the set value of the register 13-4b are indicated as l1, l2, and l3. The count signal xP is then given as the aforementioned count-out signal.

According to the circuit block shown in FIG. 4, it is not necessary to equalize the increase in the address and the increase in the amount of displacement x with respect to the address specification for the memory 16 in FIG.
For example, in the graph of Figure 3 when the diameter is 0.01 mm, the area xa~
Between xb, xP every 5.0mm, and in the next area xb ~ xc
If it is desired to change xP every 0.5 mm, the value 500 is set in the register 13-4b and the value 50 is set in the register 13-4c. FIG. 5 is a detailed circuit block diagram of the switching gate 14 and address designating section 15 shown in FIG. In the same figure, each gate 14-1, 14-2, 14-3, 1
4-4 passes or closes the input signal to it based on each control signal from the gate control section 14-5. For example, in the gate 14-3, the count signal xP regarding the displacement amount x is sent to the address counter 1.
In some cases, the count signal tP related to time t given from the gate 14-2 is given to the address counter 15-1. In this way, for a certain address counter 15-1, the count signal xP for the displacement x is calculated up to the middle of the count.
For example, the injection pressure in the injection process can be taken as an example of a physical quantity that is counted by , and then counted by the count signal tP at time t. The injection process generally consists of a filling process followed by a holding process. In the filling process, it is preferable to consider the injection pressure in relation to the displacement amount x of the injection plunger, but when moving from the filling process to the next pressure holding process, there is almost no movement of the injection plunger and the volume of resin injected into the mold increases. This is only the amount of movement in the x direction to compensate for the change (decrease) in is important in relation to molded product quality. That is, if the count signal is formed only from the displacement amount, the address count value will not change during the pressure holding process, so when programming the pressure change during the pressure holding process, it is necessary to store it in another memory area of the memory 16. If you consider that even if you try to address data that has already been stored at a different address, you cannot change that address. The technical importance of this will be understood. In the above explanation, the address counting signal was changed from x to t for the same address counter, but x→t→x,
Combinations such as t→x, t→x→t, etc. can be arbitrarily adopted, and necessary gate signals can be applied to each gate by the gate control section 14-5. 14-6 is an address setting section which outputs various gate signals in the gate control section 14-5 in response to address count values Rx and Rt given from address counters 15-1 and 15-2 in the address specifying section. Specifies the timing of occurrence. The count value Rx of address counters 15-1 and 15-2 in FIG.
Rt is further stored in a memory 16 and an allowable fluctuation range value setting section 18.
It is also given to Figure 6 shows the comparison/judgment section 1 in Figure 2.
7 and a detailed circuit block diagram of the allowable fluctuation range value setting section 18. In the same figure, signals Rx and Rt are supplied to address counters 15-1 and 15-1 in the address specifying section 15, respectively.
15-2, and the signal P is the value of the physical quantity read from the memory 16. Furthermore, the signal P' is actually detected by the detection unit 11 which corresponds to the physical quantity P mentioned above.
The reference standard value of the physical quantity given from
It is determined whether or not the reference value ΔP given by ΔP is exceeded.

Reference numerals 17-1 and 17-2 are registers in which the physical quantity P read out corresponding to the designated address as described above and the signal P' from the detection section corresponding to the same physical quantity P are set for comparison. Ru.

In the determination unit 17-3, the register 17- in the buffer register group 17-4 for the physical quantities P, P' and the value △P
The value ΔP set in 4a is taken in, and a logical operation is performed to determine whether the relationship |P-P'|>ΔP holds between these values. Furthermore, since the above equation does not determine the magnitude relationship between P and P', the following separate determinations may be made sequentially.

That is, if P>P′ then P−P′>△P If P＜P′ then P′－P＞△P It is.

Buffer register group 17-4 for allowable fluctuation range values
are different physical quantities P1, P2, P
3, P4, P5, and the physical quantities P1, P2, . Reference numeral 18 denotes a setting unit for the allowable fluctuation range value, which is the buffer register 17 described above.
-Register 18-1 and setting device 18 corresponding to 4a
-5 is provided. When the count value Rx of the address counter 15-1 regarding the amount of displacement x reaches a predetermined count value R1, . . . R5, the comparators 18-3a,
A match signal is given from -3b, -3c, -3d, -3e, and each register 18 of the setting register group 18-2
The setting values set in -2a, -2b, -2c, -2d, and -2e are successively set in the buffer register 18-1. In other words, the register 18-1 stores the allowable fluctuation range values △P11, △P12, △P13, △P1 every time the count value of the address counter 15-1 reaches R1, R2, R3, R4, R5.
4, ΔP15 are given sequentially. The allowable fluctuation range value setting section 18 includes address counters 15-1, 15-.
The aforementioned setting device 18 that responds to the count values Rx and Rt of 2
- There may be multiple setting devices with the same configuration as in 5. For example, the setting device 18-6 is address counter 1.
It is shown as responding to the count value Rt of 5-2.

FIG. 7 shows a combination of a physical quantity reference value (DATA) stored in the memory 16 of FIG. 2 and an address (ADR) corresponding to the same data.

In the same figure, (1) is xP as address counting input.
A corresponding example of such a form of data storage is, for example, the speed of the screw relative to the screw position x in a filling or metering process.

In addition, in the storage form (1) of the physical quantity d mentioned above, the address
It is also possible to take the time t instead of the displacement amount x as the ADR, and take in the temperature of the mold, the viscosity at a specific position in the injection cylinder, etc. as the physical quantity d as reference standard value data. (2) The data storage format is to take the displacement amount x of the movable member of the molding machine (e.g. injection cylinder) for address counting,
Three types of physical quantity data, d1, d2, and d3, are stored as physical quantities to be read out, and three types of physical quantity data, d1i, d2i, and d3i, are read out by specifying a certain address xi in the memory. It's becoming like that.

The storage form in (3) is the address corresponding to the displacement x
By specifying ADR1 and one of the same ADR1, three types of physical quantity data d1(x), d2(x), d3
(x) are read out at the same time. In addition, other address areas contain addresses created by the sequence of time t.
Two physical quantity data d4(t), d5 by ADR2
(t) can be read simultaneously.

In the data storage format (3), the address t0 corresponding to the time can be set independently of the address x0 corresponding to the displacement amount. In the case of data storage form (4), an example will be shown in which the address variable is changed from displacement amount x to time t when transitioning from the filling process to the pressure holding process in the injection process described above. In this example, addresses xo → xi correspond to the filling process, addresses tj → tj+i correspond to the pressure holding process, the physical quantity data d1 is obtained from the pressure detection signal in the injection cylinder, and the same pressure d1 is the address Pressure data is stored up to xi using the displacement x of the injection plunger as a variable, and from address tj onward, the pressure data is stored using time t as a variable. As a modification of this storage format (4), the address is from xi to tj.
It is natural that the physical quantity d1(x) itself can also be changed to another physical quantity d2(t) related to time. preferable. Furthermore, in storage form (5), three physical quantity data are stored corresponding to the address ADR created from the displacement x.
This is a case where d1(x), d2(x), and d3(x) are stored alternately in sequence, and in this example, the same physical quantity is read out at every second address.

The advantage of this storage format is that it saves memory capacity and provides continuity of addressing.

For example, the displacement amount is the position of the injection plunger, the first physical quantity d1(x) is the speed, the second physical quantity d2(x) is the acceleration, and the third physical quantity d3(x) is the amount of resin into the mold. It is possible to apply an injection flow rate of

Each of the storage formats explained above is a typical example, and by partially adopting each storage format, the correspondence between addresses and memory contents can be configured differently from (1) to (5). would be easily possible for those skilled in the art.

FIG. 8 shows the setting state of the permissible fluctuation range value corresponding to the reference standard value which is the stored physical quantity in the permissible fluctuation range value setting unit 18 of FIG. It is assumed that this is necessary for monitoring during one molding cycle. The address ADR takes the amount of displacement x of the movable body, and these are read out for each region in the x direction in FIG. 3. In this example, for example, the address xo
In the range of ~xa, △d1a is read out for physical d1, △d2a is read out for physical d2, and △d3a is read out for physical d3. Each of the blocks shown in FIGS. 2 to 6 is constituted by a digital computer in one embodiment of the present invention. Therefore, the components shown in each figure, such as registers, comparators, and counters, are not located at specific locations in the digital computer, but are under the control of the program control unit within the computer during the computer's operating cycle. The common hardware of the same computer is used in a time-sharing manner. However, in order to explain in detail the program processed by the computer related to the present invention, for convenience, the program is shown as if it were constituted by individual hardware in each figure. By showing this, it will be easy for an experienced computer programmer to create a program for any computer to implement the present invention. In other embodiments, each hardware element within each block in each figure may be constructed from fixedly wired digital circuits.

In yet another embodiment, some or all of the hardware elements shown in the figures above may be constructed from analog circuits.

In other words, when carrying out the present invention, the configuration is not limited to using a digital computer.

FIG. 9 shows a specific embodiment of the present invention, and the numerical symbols in the portion surrounded by the dashed line correspond to those marked with A in each block in FIG. 2. 9th
In the figure, 11A is a physical quantity detection unit, which is a detector 11.
A-2a amplifier 11A-2b, D/A converter 11
Equipped with A-2C and multiplexer 11A-2, the same 11A is installed during the molding cycle during test molding.
-2 to Y-axis data memory 1 in memory 16A
Physical quantity data from each detector is sequentially stored in 6A-1. Here, the Y-axis data is a term corresponding to the vertical axis Y of the graph shown at the right end of the figure, and means the physical quantity measured by each detector in the detection section 11A. Position pulses Px and Pt are applied to the count signal generator 13A in correspondence with the displacement amount x of the injection cylinder.

13A-1 is a pulse frequency divider that outputs one counting pulse for N consecutive <Px pulse inputs according to the frequency division ratio N set by the thumbwheel switch 13A-2.
Form xP. (shown as N=50 in the figure) A similar relationship exists between the time pulse Pt and the count pulse tP
The thumbwheel switch 13A-4 and pulse frequency divider 13A-3 correspond to this.

The counting pulse signals xP and tP are selected by switching the contactor 13A-7 up and down when the normally open contact 1RA is conductive. For example, when the inverter 13A-5 is tilted upward as shown in the figure, the output logic of inverter 13A-5 becomes 1, and when the contact RSTA is in the ON state, the signal xP
Only AND gate 13A-8, OR gate 13A
-10 and is applied to the control circuit 14A-1. On the other hand, if contactor 13A-7 is pushed down, AND gate 13A-9 and OR gate 1
A time counting pulse signal tP is applied to the control circuit 14A-1 via the control circuit 3A-10. A normally open contact 1RA and an opposite normally closed contact 1RB are similarly provided, and when the contact 1RB is in the ON state, both count signals tP and xP are used.
When push button switch PB1 is closed, inverter 13A
-12, the data setting command signal DS becomes valid and is applied to the control circuit 14A-1.
Furthermore, when the push button switch PB2 is closed again, the allowable fluctuation range value setting command signal AS becomes valid and is applied to the control circuit 14A-1. Reference numeral 14A-2 is an access signal generating section of the Y-axis data memory 16A-1, which sequentially specifies addresses within the memory 16A.
14A-3 is a register for Y-axis data, and 16A-2 is a register for clearing the contents of Y-axis memory 16A-1.
Transcribe the contents of 1. Therefore, data is not transferred to the register 16A-2 during test molding. The quality of the molded product obtained by the above-mentioned test molding operation is inspected, and if the molded product is found to be a good product, it is taken into the molding process and stored in the memory 16A.
If the data stored in the memory 16A-1 is considered preferable, the data stored in the memory 16A-1 is transferred as a reference standard value to the register 16A-2 by the above-mentioned command signal SM, and then stored in the memory 16A-1.
The contents of are erased by the clear signal CL in response to the push button switch PB1.

18A is a setting thumbwheel switch for setting the allowable fluctuation range value as a reference standard value. In the example of Fig. 9, the thumbwheel switch 13A-2, 13
Once the numerical values for both A-4 and 18A have been set, the set values will not be changed for the molded product. Moreover, the control circuit 14A-1
From 17A-1, 17A-2, 17A-3, clock signal CL synchronized with counting pulse xP or tP
17A-4 and 17A-5. Monitoring in the actual molding cycle is performed using the reference physical quantity data stored in the register 16A-2. That is, the comparison and determination section 17A
In the adder/subtractor 17A-1, data for a certain physical quantity P is given from the register 16A-2, and the allowable fluctuation range value ΔP set by the setting unit 18A is given.
Using this, the value P+.DELTA.P is calculated in the addition section AD, and the value P-.DELTA.P is similarly calculated in the subtraction section SUB and set in the upper limit value register 17A-2 and lower limit value register 17A-3, respectively. These values are then compared to the detected value P' of the physical quantity corresponding to the physical quantity during the molding process, which has been taken into the Y-axis register 16A-1 up to that time, and the comparator 17A-4.
and 17A-5, their sizes are compared as follows.

P'-(P+△P) >0...(17A-4) (P-△P)-P'>0...(17A-5) If even one of the above inequalities holds true, OR gate 1
The output logic of 7A-6 becomes 1 to notify that the physical quantity P' detected during the molding process exceeds the allowable variation range ±ΔP with respect to the standard reference value P of the same physical quantity. This signal ALM is provided to the system controller 4 (FIG. 2).

Reference numeral 101 is a hard copy control circuit which provides display data to the display device 104 on the right side. It also outputs digital information to a printer or the like. The input signals to the circuit 101 are the same as A, B, D, and E circled in FIG. 9, where A is the data of the physical quantity P' detected during the molding process, and B is the register. The standard reference data read from 16A-2, D is upper limit value data, and E is lower limit value data, which are sequentially stored in circuit 101 during the molding process, and are stored in display device 10.
4 drive, scanning is performed. A hard copy data transfer circuit 102 stores the signals A, B, D, and E in a non-volatile storage unit 103 such as a magnetic tape or paper tape.

Then, if necessary, the signals F and G can be read out from the storage unit 103 and applied to the registers 17A-2 and 17A-3 as signals corresponding to the signals D and E. Adder/subtractor 17A-1 does not operate when signals F and G are applied. It is also possible to input the signal H obtained from the signal B to the register 16A-2 instead of F and G, and in this case, even if the value is set appropriately in the allowable fluctuation range value setting section 18A. good. By using this data transfer circuit, for a certain molded product, physical quantities corresponding to a good product can be stored in the storage unit 103 in advance, so that when molding the molded product, test molding can be performed. There is no need to cycle.

As explained above, according to the present invention, the physical quantity during the molding process for a certain molded product is regarded as a pattern that responds to time or displacement throughout the molding process, and the permissible fluctuation range value is set for this pattern. Since it can be set, the setting work is not difficult compared to the conventional method of setting the allowable width value at a specific position on the pattern, and it also has a function to check for good and defective products, so it is easier to use than the conventional inspection process. can be omitted.

In the present invention, physical quantities during the molding process of a molded product formed during a test molding operation are temporarily stored in a memory, and when the molded product passes various product inspections, the physical quantity data is used as a reference standard in subsequent molding cycles. It is used as a value signal, and in this case, the means for specifying the address to the memory can be used as is at the time of testing, thereby increasing the efficiency of use of the device.

In the present invention, since multiple physical quantities are often detected at the same time, in order to save memory capacity, we used the displacement amount and the time during the molding cycle as variables for creating addresses. .

Furthermore, in the present invention, from the viewpoint of saving memory, the addressing in each molding process is not made equal, and the addressing interval can be selected for each variable area so that addresses can be specified roughly in areas where physical quantities change little.

In addition, in the present invention, the allowable variation range value for a certain physical quantity is not only set constant during one molding cycle, but can be selectively set for each variable area, so the allowable variation value can be set for each variable area in a molding process that has little effect on the molded product. It is possible to set the width value relatively large and set it small in areas where the influence is large, and thereby it is possible to achieve a substantial monitoring effect.

Furthermore, in the present invention, the physical quantities during the molding cycle and their allowable upper and lower limits can be displayed on the display device, allowing the operator to better understand the actual progress during the molding process. The determination of defective products can be visually observed. Moreover, if necessary, the data can be printed out as digital information to a printer or the like, and can later be used to correct control variables in the molding machine control system.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the entire control system of the molding machine, Figure 2 is a block diagram of the monitoring device according to the present invention, Figure 3 is a pattern diagram of physical quantities in the molding process, and Figure 4 is a circuit block of the counting signal generator. figure,
Figure 5 is a block diagram of the switching gate circuit, Figure 6 is a block diagram of the comparison/judgment section and allowable variation range value setting section, Figure 7 is a diagram showing the storage format of data in the memory, and Figure 8 is the allowable variation. FIG. 9, which is a diagram showing the width value setting contents, is a circuit block diagram of another embodiment of the present invention. 4...System controller, 11-1...Position signal generator, 12...Clock pulse generator,
13...Counting signal generation section, 14...Switching gate section, 15...Address designation section, 16...Memory,
17... Comparison/judgment section, 18... Permissible fluctuation range value setting section.

Claims (1)

[Claims] 1. The temperature, pressure, etc. of the resin that changes during the molding process according to the variable t during the molding cycle or the displacement x of the movable body constituting the molding machine. a first storage medium that stores in advance one or more physical quantities p that affect the quality of the molded products contained therein as reference standard values; and a permissible variation that corresponds to the physical quantity p over the entire range of the variables involved in the molding process. a second storage medium that stores the width value Δp in advance as a reference standard value; an addressing unit that specifies an address for the first storage medium in which the physical quantity p is stored; and a pulse signal that corresponds to the variable. (px; pt) to a count signal (count pulse) xp; tp to the address designation section; , a readout device that reads the corresponding physical quantity p and allowable variation range value Δp from the first and second storage media in accordance with the value of the variable during operation of the molding machine; A detection device that detects the actual physical quantity p′ corresponding to p, and a detection device that detects the actual physical quantity p′ corresponding to p, and the physical quantities p, p′ and the allowable fluctuation range value △p are |p′−
A monitoring device for a molding process, comprising: a determining device that sequentially determines whether or not there is a relationship p|>Δp. 2. The forming process according to claim 1, wherein the converting section of the setting device includes a frequency division ratio setting section capable of setting a frequency division ratio of the pulse signal for each variable region. Monitoring equipment. 3. The addressing section of the setting device is generated from a first counter that performs counting using a count signal xp generated from a pulse signal px corresponding to a displacement amount in the count signal generation section and a pulse signal pt corresponding to a time. a second counter that performs counting based on a count signal tp; and a physical quantity stored in the first storage medium based on the outputs of the first and second counters.
The molding process monitoring device according to claim 1, wherein addresses are specified for each of p1, p2...pn (n: an integer). 4. The addressing section of the setting device has a switching gate section that is inputted with the counting signals xp, tp and switches the corresponding counting signal xp for the first counter to another counting signal tp at a predetermined address. A monitoring device for a molding process according to claim 1. 5. With respect to one physical quantity p stored in the second storage medium, the setting device sets a plurality of allowable fluctuation range values Δp11, corresponding to each area of the variable.
The molding process monitoring device according to claim 1, further comprising a variable area setting section for selectively specifying one of Δp12...p1i. 6. The molding process monitoring device according to claim 5, wherein the variable area setting section includes gate means that responds to an address signal from an address specifying section. 7 The determination unit has a first value corresponding to a certain value of the variable.
The value p+ is calculated from the physical quantity p read out from the storage medium of , the physical quantity p' corresponding to the physical quantity p given from the detection unit at that time, and the allowable fluctuation range value Δp corresponding to the variable value of the physical quantity p. Δp, p−Δp, and a logic comparison unit that compares the addition result with the value p′, respectively, and uses the output of the logic comparison unit as a determination signal. A monitoring device for a molding process according to claim 1. 8. The molding process monitoring device as set forth in claim 1, wherein the determining unit has display means for sequentially storing the output of the adding unit and the detected physical quantity p', and scanning and displaying the same. . 9 The reading device reads a physical quantity p stored in a non-volatile memory other than the first storage medium.
2. The molding process monitoring device according to claim 1, wherein the molding process monitoring device is capable of reading out. 10 The determining section has another setting means for sequentially storing the output of the adding section in a non-volatile memory, and supplies the contents of the memory to the logical comparing section when monitoring the molding process. Range 1
A monitoring device for the molding process described in Section 1.