JP2772592B2 - Method and apparatus for monitoring injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for monitoring an injection molding machine.
Method and apparatus .

[0002]

2. Description of the Related Art In a conventional injection molding machine, time
Monitor screw position and screw speed as numbers
Or screw speed as a function of screw position
Is known.

[0003]

However, the molding conditions are as follows:
It is desirable to set according to the cavity shape of the mold and the filling state of the resin in the cavity. The injection speed and the injection pressure are switched according to the filling state in the cavity, and the measuring position is determined by the cavity capacity. If the molding conditions can be set according to the resin filling state of the mold rather than the screw position, the condition setting operation can be performed more efficiently. However, what can be monitored is the screw position
It is difficult to determine the effective conditions only with the screw speed
Become.

Accordingly, an object of the present invention is to provide a screw
Value, filling resin volume, filling resin weight and the amount of change
For monitoring injection molding machine capable of selectively monitoring
To provide a location.

[0005]

SUMMARY OF THE INVENTION The present invention provides a
The screw position is detected by the
The screw speed is detected by the detecting means, and the detected screw speed is detected.
Based on the screw position and screw speed values,
Fat volume and resin volume change rate or resin weight and resin weight
A means for calculating the rate of change in volume is provided, and
Relationship between screw position and screw speed, resin volume and tree
Relation with fat volume change rate or resin weight and resin weight change
When one of the relationships with the rate is selected, the selecting means
To display the relationship selected in the display unit as a diagram
I made it.

[0006]

[Action] Screw position and screw speed from selection means
Is selected, the detected screw position and
The relationship with the screw speed is displayed on the display, and the resin volume
When the relationship between the rate and the rate of change in resin volume is selected, the detected
The screw position is converted to resin volume and the detected screw
By converting the screw speed into the resin volume change rate, the resin volume and
The relationship with the resin volume change rate is displayed on the display means. In addition, tree
When the relationship between the fat weight and the resin weight change rate is selected, the
The screw position is converted to the resin volume and the detected screw
Lew speed is converted into the rate of change in resin weight, and the resin weight and resin
It is displayed on the display means for displaying the relationship with the weight change rate .

[0007]

EXAMPLES Hereinafter, with reference to the drawings, a description will be given of an embodiment of the present invention.

FIG. 1 is a block diagram showing a main part of an electric injection molding machine according to an embodiment of the present invention. Reference numeral 1 denotes a screw, and reference numeral 2 denotes an injection servomotor for driving the screw 1 in an axial direction. It is. In addition, the servo motor 2 for injection
Is mounted with a pulse coder 3 to detect the current position of the screw 1. The screw 1 is provided with a pressure sensor 4 for detecting an injection pressure by a resin reaction force acting in the screw axis direction.

A control device 100 of the injection molding machine includes a microprocessor for numerical control (hereinafter referred to as an NC CPU) 1.
12 and a microprocessor for a programmable machine controller (hereinafter referred to as a PMC CPU) 114. The PMC CPU 114 stores a sequence program for controlling a sequence operation of the injection molding machine.
The OM 117 and the PMC RAM 110 are connected. The NC CPU 112 has a ROM 115 storing a management program for overall control of the injection molding machine and servos for driving and controlling servomotors for each axis for clamping, screw rotation, ejector (not shown), injection, and the like. The circuit is connected via the servo interface 111. FIG. 1 shows only the servo circuit 103 for the servomotor 2 for injection.

Reference numeral 105 denotes a nonvolatile shared RAM constituted by a bubble memory or a CMOS memory, and a memory for storing an NC program for controlling each operation of the injection molding machine and various setting values, parameters, macro variables and the like. And a setting memory unit that stores values of resin density k and screw diameter (diameter) D set and input by an operator via a manual data input device with a CRT display device.
In addition, the selection state of the condition setting unit and the like are stored. 11
3 is a bus arbiter controller (hereinafter referred to as BAC)
The BAC 113 includes an NC CPU 112 and a PM
CPU 114 for C, shared RAM 105, input circuit 10
6, each bus of the output circuit 107 is connected,
3 controls the bus to be used. The injection servomotor 2 is connected to the servo circuit 103, and the torque limit value from the output circuit 107 and the detection output from the pulse coder 3 are input to the servo circuit 103. The current position of the screw is always detected. The RAM 104 is for temporarily storing data.

Reference numeral 119 denotes an operator panel controller 1
16 (hereinafter referred to as CRT / MDI) connected to the BAC 113 via the CRT display device
Various setting screens and work menus are displayed on the CRT display screen, and various setting data can be input and the setting screen can be selected by operating various operation keys (soft keys, numeric keys, etc.). ing.

An address generator 118 is connected to the output circuit 107, and the same address in the RAM 108 and the RAM 109 is designated by an address command from the address generator 118. Of these, RA
M108 stores the output signal of the pressure sensor 4 converted by the A / D converter 101 as the current injection pressure.
M109 stores the detection signal from the pulse coder 3 counted up and down by the counter 102 as the screw current position. The address generator 118 receives the sampling start signal output from the output circuit 107 at the start of injection and specifies a predetermined address (0 in the embodiment) of the RAM 108 and the RAM 109, and thereafter, the injection (including the pressure holding step) is completed. Up to the specified sampling cycle, the address is sequentially incremented, and an address command is output.
The current injection pressure and screw current position for each sampling time are temporarily stored in the corresponding addresses of the AM 108 and the RAM 109. In addition, the PMC CPU 114 operates the injection time measurement timer for each injection process,
The elapsed time from the start of injection to the completion of injection is detected for each injection step.

In the above configuration, the shared RAM 1
In accordance with the NC program and various molding conditions stored in the CPU 05 and the sequence program stored in the ROM 117, the CPU 114 for the PMC performs sequence control while the CPU 112 for the NC communicates with the servo interface 111 to the servo circuit of each axis of the injection molding machine. The drive unit controls the injection molding machine by distributing pulses via the control unit. The command unit of the control system regarding the moving position and moving speed of each axis is mm.
And mm / s.

FIG. 5 shows an example of a setting screen of the CRT / MDI 119 in which the setting screen of the injection condition and the measurement condition is selected by a soft key. The current values (cushion amount, minimum cushion amount, switching position VP from injection to holding pressure, screw position) are displayed.

When setting the injection condition and the weighing condition, the operator first displays the guidance display "1 position" of the condition setting unit regarding the filling amount (position) and the filling speed (screw speed) when the setting screen is displayed. , 2 volumes, 3 weights ”, a numeric value corresponding to a desired condition setting unit is input by ten keys to select a condition setting unit to be used, and further, according to the guidance display, the density k of the resin to be used is determined.
The numerical value of the screw diameter D is input using the numeric keypad, and the selection state of the condition setting unit and the data on the resin density and the screw diameter are stored in the shared RAM 105. PMC
The CPU 114 updates the display unit drawn in the data setting section on the screen in accordance with the condition setting unit according to the setting operation by the operator. It should be noted that the density and screw diameter of each type of resin and screw are shared in advance.
The resin density k and the screw diameter D may be stored in the memory of the M105 in a manner similar to the selection of the condition setting unit by the selection operation of the resin name and the screw type by the CRT / MDI 119.

Usually, the screw stroke in an injection molding machine indicates only the screw position (mm), and the injection rate indicates only the resin volume change rate (cm ³ / s) per unit time. Is a general term for the screw position (mm), resin weight (g) and resin volume (cm ³ ), and the name of the screw stroke is used.
The term injection rate is used as a general term for the injection speed (mm / s), the resin weight change rate (g / s), and the resin volume change rate (cm ³ / s).

FIG. 5 shows an example in which a volume is selected as the condition setting unit. In this case, the unit for setting the screw stroke is cm ^{3 of the} volume, and the setting unit for the injection rate is cm ^3. Unit cm ³
/ S automatically. When the resin weight is selected as the condition setting unit, the setting unit relating to the screw stroke is the unit g of the weight, and the setting unit relating to the injection rate is automatically changed to the assembly unit g / s using g. When the position is selected as the condition setting unit, the setting unit related to the screw stroke is the unit mm of the position, and the setting unit related to the injection rate is the condition setting unit m.
The unit is automatically changed to the assembly unit mm / s using m, and the same setting operation as in the past can be performed.

The operator who sets and inputs the condition setting unit, the density of the resin used, and the screw diameter is referred to as a CRT /
With reference to the setting screen of the MDI 119, various molding conditions, such as the injection rate of each injection stage and the switching position of the injection rate, are set and input one after another using the ten keys.

FIG. 2 is a flowchart showing an outline of an input data conversion process performed by the PMC CPU 114 every time an input operation from the CRT / MDI 119 is detected as a pre-process of data input to the shared RAM 105. Less than,
The molding condition setting method according to the present embodiment will be described with reference to this flowchart. The PMC CPU 114 that has detected the input operation from the CRT / MDI 119 stores the data set in the buffer of the CRT / MDI 119 by the operator in the set value storage memory RX for each molding condition (step S01). The setting memory unit is searched to identify the selected state of the condition setting unit.

If the condition setting unit is designated by volume (step S02), the value stored in the input / input set value storage memory RX is set to a volume-based data settable range S.
Vmin. From SVmax. Is determined (step S08), and if it is included in this range, the screw cross-sectional area πD is referred to with reference to the screw diameter D.
Calculating a ^2/4, obtains the movement amount or the moving speed of the screw corresponding to the resin volume or injection rate by dividing the value of the memory RX screw sectional area [pi] D ^2/4, sharing the value R
It is stored in the control setting value storage memory RP for each molding condition in the setting memory unit of the AM 105 (step S09), and the value of the input setting value storage memory RX is displayed (step S0).
11), end the input data conversion process. Further, the value of the input set value storage memory RX is set to the data settable range SVmin. From SVmax. If the value exceeds the range, a warning of improper input is displayed on the setting screen of the CRT / MDI 119 (step S010), and the input data conversion process ends.

The control set value storage memory RP stores data input in designated condition set units in control unit command units mm.
And an input setting value storage memory RX which stores the molding condition as it is in a designated condition setting unit, and converts the molding condition into a set value of a screw position and a screw speed in drive control. This is a memory for displaying the current set value of the molding condition on the display screen in condition setting units in response to a request to display the set value. When the condition setting unit is designated by volume, the dimension relating to the screw stroke is [length] ³ and the dimension relating to the injection rate is entered as [length] ³ / [time].
The values obtained by dividing these values by the dimension [length] ² of the screw cross-sectional area are [length] and [length] / [time], and the command unit m of the control system relating to the movement position and movement speed of each axis is m.
coincides with m and mm / s. Therefore, simply by directly inputting the resin filling volume calculated based on the mold design data as a screw stroke, the screw position (moving amount) corresponding to the resin filling volume is automatically calculated, and molding of the measuring position and the like is performed. Conditions can be set appropriately.

On the other hand, if the condition setting unit is designated by weight (step S03), the PMC CPU 114 determines that the value stored in the input set value storage memory RX is the data settable range SWmin. From SWmax. Determines whether or not included in the scope of (step S06), if included in this range, screw cross-sectional area [pi] D ^2/4
Read from the shared RAM105 values of density k of the resin used to calculate a screw by dividing the value of the memory RX a value obtained by multiplying the density k screw sectional area [pi] D ^2/4 corresponding to the weight of the resin or injection rate The amount or speed of movement of
This value is stored in the control setting value storage memory RP for each molding condition in the setting memory unit of the shared RAM 105, and the value of the input setting value storage memory RX is displayed on the setting screen (step S07, step S011), and the input data conversion is performed. The process ends. The value of the register RX is set to a weight-based data settable range SWmin. From SWmax. If the value exceeds the range, a warning of improper input is displayed on the setting screen of the CRT / MDI 119 (step S010), and the input data conversion process ends. When the condition setting unit is designated by weight, the dimension related to the screw stroke is [weight], and the dimension related to the injection rate is [weight] /
Since these values are entered in [time], these values divided by the dimension [length] ² of the screw cross-sectional area and the dimension [weight] / [length] ³ of the density are [length] and [length] 〕/〔time〕
And the command units mm and mm / s of the control system relating to the moving position and moving speed of each axis are matched, and the screw position (moving amount) corresponding to the filling weight of the resin can be obtained by directly inputting the weight of the sample shot as the screw stroke. ) Is automatically calculated, and molding conditions such as a measurement position can be set accurately.

If the condition setting unit is designated by the position, no conversion of the unit is necessary, and the PMC CPU 114
The value stored in the input set value storage memory RX is the position settable data settable range SPmin. From SPmax. (Step S0).
4) If it is included in this range, the value of the memory RX is stored as it is in the control setting value storage memory RP for each molding condition in the setting memory section of the shared RAM 105 (step S).
05) The value of the input set value storage memory RX is displayed on the setting screen (step S011), and the input data conversion process ends. On the other hand, when the value of the memory RX is the position-based data settable range SPmin. From SPmax. If the value exceeds the range, a warning of improper input is displayed on the setting screen of the CRT / MDI 119 (step S010), and the input data conversion process ends.

In the above example, only the content of the input set value storage register RX is displayed, but the value of the control set value storage register RP is also expressed in the unit (mm, mm / s).
And may be displayed in parallel.

When the display of the setting screen is selected from another display screen to confirm the setting data, etc., the PMC
The CPU 114 searches the setting memory section of the shared RAM 105 to identify the selection state of the condition setting unit, and stores the value of the input setting value storage memory RX for each molding condition in the CRT / MDI 119 in the currently selected condition setting unit. Is displayed on the display screen. In addition, by displaying the setting screen and re-designating the condition setting unit and inputting a change command, it is also possible to display the set value relating to the screw stroke or the like in the re-designated unit. In this case, the data stored in the control set value storage register RP is read and converted into a re-designated unit, then stored in the input set value storage register RX, and this value may be displayed. ,
This process is substantially the same as the process shown in FIG.

In this embodiment, the current position of the screw is simultaneously monitored and displayed on the setting screen of the injection condition and the measurement condition. The current position of the screw is expressed in the unit of command mm of the control system relating to the movement position of each axis. Since it has been detected, it is necessary to convert this value into a desired unit according to the state of selection of the condition setting unit before displaying it. Then, P
The MC CPU 114 performs a display unit conversion process as shown in FIG. 3 when displaying the current position of the screw.

PMC CP that has started display unit conversion processing
U114 searches the setting memory section of the shared RAM 105 to identify the selected state of the condition setting unit. If the condition setting unit is specified by volume (step T01), the value PN of the screw current position is stored in the shared RAM 105. Of the screw cross section πD ²
After calculating the resin volume corresponding to the screw position PN by multiplying the value by / 4 and storing it in the register RW for display (step T06), the condition setting unit c currently selected
with m ³ the value of the register RW CRT / MDI119
(Step T04). If the condition setting unit is designated by weight (step T0)
2), calculates the current resin weight corresponding to the screw position PN multiplied by the value of the density k of the position of the value PN screw sectional area [pi] D ^2/4 values and using the resin of the screw, stored in the register RW for display After that (step T05), the register RW is displayed together with the condition setting unit g currently selected.
Is displayed on the display screen of the CRT / MDI 119 (step T04). When the condition setting unit is designated by a position, it is not necessary to convert the current position of the screw to another unit and display it. Therefore, the PMC CPU 114 stores the value PN of the current position of the screw in the display register RW. After the transfer (step T03), the value of the register RW is stored in the CRT / MD together with the condition setting unit mm currently selected.
I119 will be displayed on the display screen (step T
04).

FIG. 6 shows, as an example of a monitor screen for displaying the relationship between the injection pressure and the injection rate and the screw stroke in the injection step including the holding pressure in the form of a diagram, the relationship between the injection pressure and the resin volume change rate and the resin volume. Shows a state in which the display screen is selected by a soft key. Further, in the present embodiment, in order to enable the selective display of the monitor screen in accordance with the selection status of the condition setting unit, it is possible to select the resin weight and the screw position as a reference indicating the screw stroke. When the resin weight is selected as the condition setting unit, the display unit related to the screw stroke is the weight unit g, and the display unit related to the injection rate is automatically changed to g / s. When the screw position is selected as the condition setting unit, the display unit related to the screw stroke is the unit of length mm, and the display unit related to the injection rate is automatically changed to the assembly unit mm / s using mm. You.

FIG. 4 is a flow chart showing the outline of the monitor display process executed immediately after the completion of the injection for each process in a state where the monitor screen is selected.

PMC CPU that has started monitor display processing
A search unit 114 searches the setting memory unit of the shared RAM 105 to identify a selection state of a condition setting unit, and displays a unit related to a screw stroke (horizontal axis) and a unit related to an injection pressure and an injection rate (vertical axis) on each axis on a display screen. , First, the value of the address search index i is initialized to 0 (step U01), and based on the value of the address search index i, the RAM 10
In addition to reading the injection pressure Fi at the i-th sampling stored in the i-th address of No. 8, the i-th and i-th stored in the i-th address and the (i + 1) -th address of the RAM 109 are read.
Screw positions Pi and Pi + at the time of +1 sampling
1 is read (step U02), and a value obtained by subtracting the screw position Pi + 1 at the time of the (i + 1) th sampling from the screw position Pi at the time of the i-th sampling, that is, the screw movement amount per unit time is divided by the sampling period Δt to obtain the i-th screw. It is stored as the screw moving speed Vi at the time of sampling (step U03). In this embodiment, since the screw most advanced position (cylinder tip position) is determined as the origin of the screw position, the value of the screw current position moving from the metering completion position PS toward the most advanced position by the start of injection always decreases. , (Pi−Pi + 1) are always positive.

[0031] At this time, if the condition setting unit, if specified by the volume (step U04), screw position by multiplying the value of the screw cross-sectional area [pi] D ^2/4 to the screw movement amount (Ps-Pi) at the i-th sampling It calculates a total emission volume of the resin corresponding to Pi, which is then stored in the stroke corresponding value storage register X (step U11), further, the value of the screw cross-sectional area [pi] D ^2/4 to the screw moving velocity Vi at the i-th sampling Calculate the change rate of the resin volume corresponding to the screw position Pi by multiplying by
(Step U12). Then, the total discharge volume X of the resin at the screw position Pi and the screw position P
Point data (X, Fi) indicating the injection pressure based on the relationship with the injection pressure Fi at i, and the relationship between the total discharge volume X of the resin at the screw position Pi and the rate of change Y of the resin volume at the screw position Pi. After plotting the point data (X, Y) indicating the injection rate on the monitor screen of the CRT / MDI 119 (step U08), the value of the address search index i is incremented by 1 (step U09), and the address search index i Is the total number of samplings this time n)
That is, the value of the injection time measurement timer is changed to the sampling period Δt.
It is determined whether or not it exceeds the value n divided by (step U10). If the value of the address search index i does not exceed the value of the total sampling number n, the PMC CPU 114 proceeds to the processing of step U02, and thereafter repeatedly executes the same processing as described above until the determination result of step U10 becomes true. Then, the data in the RAM 108 and the RAM 109 are sequentially read out, and point data (X, Fi) indicating the injection pressure based on the relationship between the total discharge volume X of the resin at each sampling time and the injection pressure Fi, and at each sampling time Each of the point data (X, Y) indicating the injection rate based on the relationship between the total discharge volume X of the resin and the rate of change Y of the resin volume at CRT /
The plots are sequentially plotted on the monitor screen of the MDI 119 to show the relationship between the injection pressure Kg / cm ² (vertical axis) and the injection rate cm ³ / s (vertical axis) and the total resin discharge volume cm ³ (horizontal axis) with respect to the screw stroke. The diagram shown is CRT / MDI1
19 is displayed on the monitor screen.

On the other hand, if the condition setting unit is determined that the specified weight (step U05), the screw sectional area [pi] D ^2/4 values for screw movement amount from the injection start position (Ps-Pi) Is multiplied by the value of the density k of the used resin to calculate the total discharged weight of the resin corresponding to the screw position Pi, and stores the calculated value in the stroke corresponding value storage register X (step U13). The screw moving speed Vi at the i-th sampling
Density k screw sectional area [pi] D ^2/4 values and using resin
, The change rate of the resin weight corresponding to the screw position Pi is calculated and stored in the injection rate storage register Y (step U14). The point data (X, Fi) indicating the injection pressure based on the relationship between the total discharge weight X of the resin at the screw position Pi and the injection pressure Fi at the screw position Pi, the total discharge weight X of the resin at the screw position Pi, and Point data indicating the injection rate based on the relationship with the change rate Y of the resin weight at the screw position Pi (X,
Y) is plotted on the monitor screen of the CRT / MDI 119 (step U08), and the value of the address search index i is incremented by 1 (step U09). It is determined whether or not it has exceeded (step U10). If the value of the address search index i does not exceed the value of the total sampling number n, the PMC CPU 114 proceeds to the processing of step U02, and thereafter repeatedly executes the same processing as described above until the determination result of step U10 becomes true. Then, the data in the RAM 108 and the RAM 109 are sequentially read out, and point data (X, Fi) indicating the injection pressure based on the relationship between the total discharge weight X of the resin and the injection pressure Fi at each sampling, and at each sampling, The point data (X, Y) indicating the injection rate are sequentially plotted on the monitor screen of the CRT / MDI 119 on the basis of the relationship between the total discharge weight X of the resin and the rate of change Y of the resin weight at cm ² (vertical axis)
A graph showing the relationship between the injection rate g / s (vertical axis) and the total resin discharge weight g (horizontal axis) with respect to the screw stroke is displayed on the monitor screen of the CRT / MDI 119.

When it is determined that the condition setting unit is designated by the position, the dimensions of the screw position and the screw moving speed coincide with the dimensions of the screw stroke and the injection rate. Conversion processing for displaying data is not required, and CMC for PMC
The PU 114 transfers the value of the screw movement amount (Ps-Pi) from the injection start position at the time of the i-th sampling and the value of the screw movement speed Vi at the time of the sampling to the stroke correspondence value storage register X and the injection rate storage register Y as they are ( Step U06, Step U0
7) Point data (X, Fi) indicating the injection pressure based on the relationship between the screw movement amount X and the injection pressure Fi at the screw movement amount X, and the injection speed Y at the screw movement amount X and the screw movement amount X. After plotting the point data (X, Y) indicating the injection rate on the monitor screen of the CRT / MDI 119 based on the relationship (step U08), the value of the address search index i is incremented by 1 (step U0).
9) It is determined whether or not the value of the address search index i exceeds the current total sampling number n (step U1).
0). If the value of the address search index i does not exceed the value of the total sampling number n, the PMC CPU 114 proceeds to the processing of step U02, and thereafter repeatedly executes the same processing as described above until the determination result of step U10 becomes true. Then, the data of the RAM 108 and the RAM 109 are sequentially read, and the screw movement amount X at each sampling time is read.
(X, Fi) indicating the injection pressure based on the relationship between the injection pressure Fi and the injection pressure Fi, and the point data (X indicating the injection rate based on the relationship between the screw movement amount X and the injection speed Y at each sampling time. , Y) to CRT / MDI11
9 on the monitor screen, and the injection pressure Kg / c
A diagram showing a relationship between m ² (vertical axis), injection rate mm / s (vertical axis), and screw movement amount mm (horizontal axis) from the injection start position with respect to the screw stroke is displayed.

When the monitor screen is displayed, the condition setting unit is re-designated and the same processing as in FIG.
Regardless of the condition setting unit at the time of setting the molding condition, a diagram showing the relationship between the injection pressure and the injection rate and the screw stroke can be displayed in an arbitrary unit. Also, CRT
The monitor screen of / MDI 119 may be cleared for each injection step, or data for each injection step may be overwritten.

[0035]

According to the present invention, screw position, resin volume,
Select the relationship of injection rate according to the change rate according to resin weight
Screw position, body
Easy setting of molding conditions and adjustment of molding conditions based on product and weight
To optimize the molding conditions.
You.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of an injection molding machine according to an embodiment for implementing the methods of the present invention.

FIG. 2 is a flowchart showing an outline of input data conversion processing by a control device of the injection molding machine in the embodiment.

FIG. 3 is a flowchart showing an outline of display unit conversion processing by the control device.

FIG. 4 is a flowchart showing an outline of a monitor display process by the control device.

FIG. 5 shows an example of a molding condition setting screen.

FIG. 6 shows an example of a monitor screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw 2 Injection servo motor 3 Pulse coder 100 Control device 102 Counter 103 Servo circuit 105 Shared RAM 109 RAM 111 Servo interface 112 CPU for NC 114 CPU for PMC 119 Manual data input device with CRT display

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsuhiro Uchiyama 3580 Kobaba, Oshino-mura, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture FANUC CORPORATION Product Development Laboratory (56) References JP-A-62-170316 (JP, A) JP-A-3-69331 (JP, A) JP-A-2-147315 (JP, A) JP-A-3-3003 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) B29C 45/48-45/52 B29C 45/76

Claims (2)

(57) [Claims] 1. A screw position and a screw speed value during an injection molding operation are detected at predetermined intervals, and a control unit of an injection molding machine controls a resin volume and a resin volume change rate, a resin weight and a resin weight based on the detected values. A resin weight change rate is obtained, and one of a relation between a screw position and a screw speed, a relation between a resin volume and a resin volume change rate, or a relation between a resin weight and a resin weight change rate is selected by a selection command. A method for monitoring an injection molding machine, comprising displaying and outputting a diagram showing an injection rate. 2. A screw position for detecting a screw position.
Position detecting means and screw speed for detecting screw speed
Degree detection means, and the screw at predetermined intervals during the injection molding operation.
-Detected by position detection means and screw speed detection means
Screw position and screw speed values
Means for determining the resin volume and the rate of change in the resin volume;
Means for determining the fat weight and the resin weight change rate, and
-Relationship between position and screw speed, resin volume and resin volume
The relationship between the change rate or the resin weight and the resin weight change rate
Selecting means for selecting any of the relationships, and the selecting means
Display means for displaying the relationship selected in
A monitoring device for an injection molding machine, characterized in that: