JPH11268142A - Temperature measurement display method of foaming process and foam molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the difference in individual products, to shorten a cycle simply and correctly, and to elucidate the causes of generation of defects during molding easily in terms of temperature control by a method in which in tempera ture control which has relied on skilled operators, the temperature of a foaming body in the heating process of foaming. the temperatures of cavity forming parts, the temperature in a steam chamber, and so on are measured, and the results are visualized by a graph or the like. SOLUTION: At least one of the temperatures ta3, tb3 of the cavity forming parts 1a1, 1b1 of a mold 1 in a foaming process, the temperatures ta1, tb1, ta5 tb5 in a seam chamber, or the temperatures ta2, tba. ta4, tb4 of a foaming body is measured, the temperature measurement data Ta1-Tb5 are stored to be visualized at any time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention measures at least one of the temperature of a foamed molded article in a cavity, the temperature of a cavity component of a mold, and the temperature of a steam chamber, and measures a change in the temperature or a pre-input. The present invention relates to a display method by which a deviation from a reference temperature, which has been set, can be displayed and visualized by, for example, a graph or the like, and a foam molding machine provided with the method.

[0002]

2. Description of the Related Art In a foam molding operation, it is important to equalize the temperature of the entire mold in order to shorten the cycle and eliminate the difference in the solids of products. However, conventional foam molding machines are inexpensive foam products themselves, so the foam molding machines themselves must be mechanically simple, and only very simple display devices are installed. Was. Therefore, the temperature of the foamed molded article, the temperature of the cavity forming portion of the mold, the temperature of the steam chamber, and the like were not measured, and they relied exclusively on the intuition and experience of skilled workers.

[0003]

According to the present invention, the temperature control, which has conventionally relied on the intuition and experience of a skilled worker, has been changed to the temperature of a foamed molded article, the temperature of a cavity component, and the temperature of a steam chamber in a heating step of foamed molding. Measurements and visualization of them with graphs, for example, can eliminate individual differences in products and shorten the cycle easily and accurately. The solution is to be able to clarify the problem.

[0004]

The temperature measuring and displaying method according to the first aspect of the present invention provides a method for measuring and displaying a temperature (ta3) (tb3) or a temperature of a cavity component (1a1) (1b1) of a mold (1) in a foam molding process. Room temperature (ta1) (tb1) (ta5) (tb5) or the temperature of the foam (S)
Measure at least one of (ta2) (tb2) (ta4) (tb4),
The temperature measurement data (Ta1) to (Tb5) are stored and called up at any time to perform a visual display ”.

According to this, temperature measurement data (Ta1) to (Tb
5) can be detected and stored continuously or at predetermined intervals, and can be called up as necessary and visualized by means such as graphing so that the operating status can be grasped from the aspect of temperature measurement. become.

Here, throughout the specification, the highest concept of the measured temperature is represented by (t), and when distinguishing between the female and male molds (1a) and (1b), they are referred to as (ta) (tb). In addition, (a) and (b) are added after (t). Furthermore, when displaying the measured temperature individually,
Arabic numerals are added to the end, such as (ta1) to (tb5). Temperature measuring device (m) described later and reference temperature data
(θ) and deviation (△ t) are also displayed.

[0007] The second aspect of the present invention is the detection temperature data (Ta1) to (Tb5).
(Θta1) to (θta1) to (θb5)
When visualizing (tb5)
Temperature (ta3) (tb3) of cavity component (1a1) (1b1) of (1)
Alternatively, at least one of the reference temperature data (θa1) of the steam chamber temperature (ta1) (tb1) (ta5) (tb5) or the temperature (ta2) (tb2) (ta4) (tb4) of the foam molded article (S) (θb5) is stored in advance, and the temperature (ta3) (tb3) or the temperature of the steam chamber of the cavity component (1a1) (1b1) of the mold (1) in the foam molding process
(ta1) (tb1) (ta5) (tb5) or the temperature (ta2) (t
b2) measuring at least one of (ta4) and (tb4), the reference temperature data (θa1) to (θb5) and the temperature measurement data (Ta1) to
(Tb5) and compare the deviations (△ ta1) to (△ tb5) to calculate the deviations (△ ta1) to (△ tb5) and call them up at any time for visual display. It is characterized by things.

According to this, since the reference temperature data (θa1) to (θb5) in the non-defective state of the mold (1) are known in advance, for example, when the mold is changed due to a lot change, a trial run is performed. By comparing the temperature measurement data (Ta1) to (Tb5) at the time of the above and the reference temperature data (θa1) to (θb5) of the ideal state, the condition can be quickly adjusted to the ideal state, and the setup work is remarkable. Shortening and the need for skilled workers can be reduced.

Also, by visualizing the deviations (△ ta1) to (△ tb5) here, how much the detected temperature data (Ta1) to (Tb5) deviates from the reference temperature data (θa1) to (θb5) It is a powerful means for quickly detecting and correcting abnormalities. As a method of visualizing the divergence, as shown in FIG. 3, the reference temperature data (θa1) to (θb5) are displayed as (θ) (T) (Δt) which is the highest concept in FIGS. ) Is taken in a straight line, and the detected temperature data (Ta1) to (Tb5) are displayed above and below the center to visualize the deviations (△ ta1) to (△ tb5), as shown in FIG. Process (mold heating, one-side heating, reverse one-side heating,
Through each step of double-sided heating) or by graphing the reference temperature data (θa1) to (θb5) for each of the above steps, and superimposing the detected temperature data (Ta1) to (Tb5) on the graph, the deviation (△ ta1)
There is a way to visualize ~ (△ tb5).

[0010] In any case, when the comparison display is performed on the same scale, the difference is difficult to see, so the deviation (△ ta1) to (〜tb
If 5) is too small, the difference is emphasized by displaying an integer value near the maximum value of the deviations (△ ta1) to (△ tb5) at full scale, so that the difference is emphasized. Detected temperature data (T
a1) to (Tb5) or an average curve of data measured and accumulated several times continuously may be used as the reference temperature data (θ).

A third aspect of the present invention relates to a means for visualizing, which is characterized by "displaying visually by graphing". As a comparison means, plotting the temperature measurement data (Ta1) to (Tb5) in chronological order and making it a graph is the easiest way to compare the data, and in this way even an unskilled person can It is now possible to easily determine the conditions at the time of mold replacement and take measures against defects.

A fourth aspect of the present invention relates to a foam molding machine having the temperature measurement data detecting means of the first to third aspects, wherein "the measurement is performed at a plurality of locations of the mold (1)". In this way, in the case of the temperature in the mold (1) and each part of the foam molding (S) or the multi-cavity mold (1), each foam molding (S)
It is possible to know the variation of each temperature, etc., and it is possible to more easily manage the temperature in the mold (1).

A sixth aspect of the present invention relates to a foam molding machine having a temperature measuring and displaying device, "a foam mold having a steam chamber (2a) (2b)".
(1), disposed so that the detection portion is exposed to the cavity (2a) (2b) of the mold (1), the temperature of the foam molded body (S) in the cavity (2a) (2b) (ta2) (tb2) (ta4) (tb4) for measuring the temperature of the foamed molded body (ma2) (mb2) (ma4) (mb4), or mold (1)
Mold temperature measuring device (ma3) (mb3) for measuring the temperature (ta3) (tb3) of the cavity components (1a1) (1b1), or the steam chamber (2a) (2b)
The temperature of the (ta1) (tb1) (ta5) (tb5) to measure at least one of the steam chamber temperature measuring device (ma1) (mb1) (ma5) (mb5), from the temperature measuring device (m) Temperature measurement data (Ta1) to (T
b5) and a storage device (17b) for storing
7b) and a display device (24) for calling temperature measurement data (Ta1) to (Tb5) and displaying a change in temperature.

[0014] Claims 5 and 7 provide a warning is issued when the measured temperature (T) exceeds an allowable range, and the operation is stopped when the measured temperature (T) exceeds an allowable limit (θmax) (θmin). Equipped with an alarm mechanism (25). "

As a result, not only is it possible to know the occurrence of an abnormality quickly, and to take a countermeasure against the defect as soon as possible, but also, when the allowable limit (θmax) (θmin) is exceeded, an emergency stop is performed to produce a defective product. Can be stopped immediately, which is very preferable in terms of yield management.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The outline of a foam molding machine according to the present invention and a method for measuring its temperature will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention, in which a mold (1) for foam molding is a male mold.
(1a) and female type (1b), each with a steam chamber (2a) (2b)
Drain piping (20a) (20b), cooling piping (2
2a) (22b), not shown, air piping and other necessary members are installed.

From the steam source (10), steam pipes (3a) and (3b) are led out and connected to the male and female molds (1a) and (1b), respectively. Control valves (5a) (5b) for these steam pipes (3a) (3b)
Is installed. The control valves (5a) and (5b) reduce the pressure of the steam discharged from the high-pressure steam source (10) to a required pressure and control the flow rate so that the pressure in the steam chambers (2a) and (2b) becomes a predetermined value. In this embodiment, the piston valve is used as a control valve because the same operation can be obtained by controlling the opening degree of the piston valve.

The steam piping (3a) (3b) is a steam side hose.
They are connected to the steam side bases (13a) (13b) provided on the male and female molds (1a) (1b) via (14a) (14b). In addition, steam piping (3
a) Switching valves (6a) and (6b), which are two-way valves, are provided upstream of the control valves (5a) and (5b) of (3b), and the steam piping (3a)
Open / close control of (3b) is performed directly.

The drain side is connected to drain hoses (12a) and (12b) led out from the bottoms of the male and female molds (1a) and (1b).
a) (7b) is detachably connected, and the drain hose (7a)
A drain valve is provided at the pipe section (9a) (9b) provided downstream of (7b).
(8a) and (8b) are connected, and the drain pipe (2
0a) and (20b).

The pilot pipes (11a) and (11b) connected to the pressure detectors (4a) and (4b) are pipe sections between the drain hoses (7a) and (7b) and the drain valves (8a) and (8b). (9a) (9b) or a drain valve (18a) (18a) (18a) connected to the drain valve (8a) (8b) itself at the upstream side of the valve body to match the steam pressure in the steam chamber (2a) (2b).
The pressure in b) is detected, and the analog signal is sent to an analog input interface (17d) of the control unit (cont), which will be described later, instead of the analog signal. Of course, the connection positions of the pilot pipes (11a) and (11b) are not limited to the positions described above, and may be directly connected to the steam chambers (2a) and (2b) as in the conventional case.

In the present embodiment, the temperature measuring device (m) mounted on the mold (1) is disposed so that the detection portion is exposed in the cavities (2a) and (2b) of the mold (1). Foam molded body in cavity (2a) (2b)
(S2) Temperature measuring device (ma2) (mb2) (ma4) (mb4) for measuring the temperature (ta2) (tb2) (ta4) (tb4), or cavity component of mold (1) (1a1) (1b1) temperature (ta3) (tb3) to measure mold temperature (ma3) (mb3), or steam chamber (2a) (2b) temperature (ta1) (tb1) (ta5) ( There is a steam chamber temperature measuring device (ma1) (mb1) (ma5) (mb5) for measuring tb5).

As shown in the figure, all of these temperature measuring devices (m) may be provided, but only one of them may be used, or a combination of and / or may be used. Further, the temperature measuring devices (m) may be provided one by one, or a plurality of the temperature measuring devices (m) may be provided, and a plurality of temperature measuring devices (m) may be measured at different locations of the mold (1). When installed vertically, the temperature distribution above and below the mold (1) or the foamed article (S) can be understood. The temperature measuring device (m) depends on the installation location. (A) The temperature (ta2) of the foam molded product (S) in the cavities (2a) and (2b)
(tb2) (ta4) (tb4), (b) Temperature (ta) of cavity component (1a1) (1b1) of mold (1)
3) (tb3), (c) or measuring the temperature (ta1) (tb1) (ta5) (tb5) of the steam chamber (2a) (2b), and the analog input interface (17d) of the control unit (cont) described later. Temperature measurement analog signal (Ta1 ') to (Tb5')
Is output.

The control unit (cont) includes a keyboard (23), a display device (24), an alarm mechanism (25), a control circuit (17), and control drive units (19a) (19b) such as an electropneumatic proportional valve. The control valve driving air pressure source (18) passes through the control valve driving pipe (18a) and the control driving unit (19a) (19).
b) is connected. The pilot compressed air controlled by the control drive units (19a) and (19b) is supplied to the pilot pipes (11a ') and (11) coming out of the control drive units (19a) and (19b).
b '), control valves (5a) (5b) through switching valves (6a) (6b)
Supplied to the control section (5a) and (5a) of the
(5a) and (5b) valve opening degree control are performed.

The control circuit (17) includes a vapor pressure set value (Xkg / cm ² ) from the keyboard (23),
Ideal reference temperature data (θa1) to (θb5) << Reference temperature data (θ) is not input by the operator in advance, and the control circuit (17) takes in data at the non-defective stage and automatically calculates and sets it. You may make it so. The key input setting circuit (17a) that receives the input of》, the set value (X) input to the key input setting circuit (17a), the reference temperature data (θ), the detected vapor pressure data (Z) described later, and the deviation (△ t) and stores the stored contents (X) (θ) (Z) () t)... relating to the vapor pressure setting in accordance with the input from the keyboard (23), in the data conversion circuit (17c), the display device (24) or The storage circuit (17b) which outputs to the alarm mechanism (25) in an emergency, the storage circuit to the die steam pressure data (Z) from the pressure detection device (4a) or (4b), or (4a) and (4b) In order to correspond the output value (X) from (17b), a data conversion circuit (17c) that converts the data (X) to (Y),

[0025] Pressure detecting device (4a) (4b) and temperature measuring device
An analog input interface (17d) that takes in the analog signals (Z ′) and (T ′) from (m) .The output values (Z ′) and (T ′) from the analog input interface (17d) are expressed as (Z) (T )
A / D data conversion circuit (17e) that outputs the conversion value (Z) (T) to the comparison processing circuit (17f) and the conversion value (T) (Z) to the storage device (17b), the data conversion circuit (17c) Output value (θ) (X) and A / D
A comparison processing circuit (17) that takes in the output values (Z) and (T) of the data conversion circuit (17e), performs a comparison operation, and outputs the deviation (△ t).
f),

The output value (△ t) of the comparison processing circuit (17f)
And a D / A data conversion circuit (17h) for converting the output value (△ t) of the feedback calculation circuit (17g) from a digital value to an analog value (△ t '). ), And an analog output interface (17i) for outputting the value (△ t ′) from the D / A data conversion circuit (17h) to the control drive units (19a) (19b).

On the other hand, the temperature measurement converted digital data (T = T) of each of the temperature measuring devices (ma1) to (mb5) output to the storage device (17b).
Ta1 to Tb5) are stored in the storage device (17b), and one of the temperature measurement converted digital data (Ta1) to (Tb5) is called up as necessary and displayed on the display device (24). Alternatively, any two or more of them are picked up and superimposed and displayed on the display device (24).

The display method may be a numerical display, a graph display or any other appropriate display method. In this embodiment, a graph display is employed. In FIG. 2, section (I) is a mold closing step, (II) is a pre-expanded bead filling step, (III) is a mold preheating step, (IV) is a one-side heating step, (V) is a reverse one-side heating step,
(VI) is a double-sided heating step, (VII) is a water cooling step, (VIII) is a drainage step, (IX) is a cooling step, and (X) is a mold opening step.

FIG. 2A is a graph showing a change in the mold steam pressure on the female mold (1b) side, and FIG. 2B is a graph showing a change in the mold steam pressure on the male mold (1a). FIG. 2 (c) shows the cavity components (1a1) (1b) of the mold (1) in the foam molding process.
It is a graph which shows the temperature change of 1). FIG. 2D is a graph in a case where both the graph showing the change in the mold vapor pressure and the graph showing the temperature change are superimposed and displayed on the display device (24). In addition, the output values of the pressure detection devices (4a) and (4b)
(Z) is also stored in the storage device (17b), and is called by the display device (24) as needed.

Of course, the reference temperature data (.theta.a1) to (.theta.b5) input by the keyboard (23) or the apparatus itself by the automatic calculation alone or the temperature measurement data (Ta1) to (Tb5), the data of the mold steam pressure. It is also possible to superimpose and display on the display device (24). The display method is as described above for various data
(t) (T) (θ) may be displayed as a graph, but from the reference temperature data (θa1) to (θb5), the detected temperature data (Ta1) to (Tb5)
The deviation (偏差 t = △ ta1 to △ tb5) obtained by subtracting the difference may be visualized as shown in FIGS. 3 and 4. By taking the deviation (△ t) in this way, the detected temperature data (T) becomes the reference temperature data. The degree of deviation from (θ) can be easily understood, and this is an effective means for quickly detecting and correcting an abnormality.

FIG. 3 shows an example in which the reference temperature data (θ) is linearly displayed, and the detected temperature data (T) is displayed vertically above and below the center to visualize the deviation (△). Through the respective steps (die heating, one-side heating, reverse one-side heating, each step of double-sided heating) or graph the reference temperature data (θ) for each of the above steps, overlay the detected temperature data (T) on this deviation
(△ t) is visualized.

In any case, when the comparison and display are performed on the same scale, the difference is difficult to see. If the deviation (△ t) is too small, an integer value near the maximum value of the deviation (△ t) is displayed in full scale. Doing so emphasizes the difference and makes it easier to see. An average of the curves of the reference temperature data (θ) may be used as the reference.

In FIG. 3, a certain allowable range is provided above and below the reference temperature data (θ), and temperature allowable limits (θmax) and (θmin) are provided on both sides thereof. If it exceeds the limit, an alarm is issued by the alarm mechanism (25) to notify the operator of the occurrence of the abnormality,
The measured temperature data (T) further increases the allowable temperature limit (θmax) (θmin)
If the number exceeds the limit, the operation is immediately stopped to investigate the cause and recover. If data such as the present device is stored in the storage device (17b), the work for investigating the cause is simpler and useful for recovery.

The operation of the control unit (cont) will now be described. The foam molding process is roughly classified into a “die heating process”, a “one-side heating process”, and a “reverse one-side heating process”, a “double-side heating process” and a “cooling process”, which are performed as necessary. In the main, the temperature measurement is performed in the "die heating step", the "one-side heating step" in which the foam molding (S) is heated, and the "reverse one-side heating step" and the "double-sided heating step", which are performed as necessary. .

The "one-side heating step" and "the reverse one-side heating step"
In the "double-sided heating step", at least one of the drain valves (8a) or (8b), or (8a) and (8b) is closed. Then the closed drain valve (8a) or (8b), or (8a) and (8b) does not flow steam, so the steam chamber (2a) or
(2b) or the same pressure as (2a) and (2b). Therefore,
The pressure detection of the steam chamber (2a) or (2b), or (2a) and (2b), is performed with the closed drain valve (8a) or (8b), or (8a) and
(8b) side pressure sensing device (4a) or (4b), or (4a) and
(4b) will be used.

Now, when the steam is supplied to the steam chamber (2a) or (2b) or (2a) and (2b) while the maximum flow rate or the flow is controlled via the control valves (5a) and (5b), the steam is closed. Pressure sensor (4a) or (4b) connected to the other drain valve (8a) or (8b), or (8a) and (8b), or (4a) and (4
According to b), the steam pressure of the steam chamber (2a) or (2b) or the steam pressure of (2a) and (2b) is detected, respectively, and input as an analog signal (Z ′) to the analog input interface (17d). This analog signal (Z ′) is converted into a digital signal (Z) by an A / D conversion circuit (17e) and input to a comparison processing circuit (17f).

On the other hand, the data of each step of the mold (1) attached to the foam molding machine at that time is input to the memory circuit (17b), and the data of that step (for example, in the case of the double-sided heating step, , The steam pressure of the mold (1) in the process
(X) is read from the storage circuit (17b), and the data conversion circuit (1
The data is converted (for example, (X) → (Y)) in 7c) and output to the comparison processing circuit (17f). Data conversion by the data conversion circuit (17c), the read value (X) from the storage circuit (17b)
Is converted to (Y), and the output value (Z ') from the analog input interface (17d) can be compared with the output value (Z) digitally converted by the A / D conversion circuit (17e). is there.

The comparison processing circuit (17f) compares the two input data (Y) and (Z) with each other, and then inputs the data to the feedback operation circuit (17g), where the deviation is determined based on (Y).
(△ t) is calculated and output to the A / D conversion circuit (17h). This digital signal (△ t) is converted into an analog signal (△ t ') by the D / A conversion circuit (17h), and the analog output interface (1
Output to 7i).

From the analog output interface (17i), the converted analog signal (△ t ′) is output to the control valve drive (19a) or (19b), or (19a) and (19b),
If the set value << (X) → (Y) >> does not match the detected value (Z) of the pressure detector (4a) or (4b), or (4a) and (4b), the set value << (X) → (Y) >> until the detection value (Z) matches the control valve (5a) or (5
b) Or, the control of the valve opening degree of (5a) and (5b) is performed, and the control of the steam pressure by the optimal set value in the process is performed. Such an action is similarly performed in other steps as necessary.

The above-described mold steam pressure control is performed through the heating process, and the steam chambers (2a) and (2b) during that time are controlled.
Temperature (ta1) (tb1) (ta5) (tb5), temperature (ta3) (tb3) or cavity (2) of the cavity part (1a1) (1b1) of the mold (1)
a) Temperature of the foamed molded article (S) in (2b) (ta2) (tb2) (ta4) (tb4)
Is a thermometer (ma2) (mb2) for the foamed molded body arranged so that the detection portion is exposed in the cavities (2a) and (2b) of the mold (1).
(ma4) (mb4), cavity component of mold (1) (1a1) (1b1)
Mold temperature measuring device (ma3) (mb3) or steam room (2a) (2b)
Is detected by a steam chamber temperature measuring device (ma1) (mb1) (ma5) (mb5).

The detected temperature data (ta1) to (tb5) are transmitted through the same route as described above, that is, when the temperature is detected, the analog signal (T
a1 ') to (Tb5') and the analog input interface (1
7d), and the analog signals (Ta1 ′) to (Tb5 ′)
The signals are converted into digital signals (Ta1) to (Tb5) by the D conversion circuit (17e) and input to the storage device (17b) in time series.

As described above, these digital data (Ta1) to (Tb5) can be taken out at any time and displayed on the display device (24) alone or superposed. Digital data (Ta1) ~
The store of (Tb5) may be only one shot, but it is preferable to store a plurality of data in order to find out the cause of the defective product and to determine the condition. In this case, it is preferable that a plurality of data or ideal temperature data are drawn on the display device (24) so as to be superimposed so that the difference between the curves can be easily read.

When the lot production is completed and the mold is replaced, the mold number of the replaced mold is inputted, and the data of the mold number is read from the storage device (17b) as described above, and the data of the mold is read. Optimal feedback control is performed in each step. In addition, the ideal temperature data of the mold (1) is also input to the storage device (17b) at the same time, and is used as reference data for condition determination.

Hereinafter, an application example of the present invention in a heating step in a foam molding machine will be briefly described. First, prior to the foam molding work, the data of the holding mold (1) ... (for example, mold heating,
The steam pressure (X1) Kg / cm ² , (X2) Kg / cm ² … ideal reference temperature data (θa1) to (θb5) etc. for each process such as one-side heating, reverse one-side heating and double-sided heating) At (23), the data is input to the key input setting circuit (17a) and stored in the storage device (17b).
Of course, the optimum data may be individually input from the keyboard (23) each time the mold is replaced without using the storage device (17b).

The mold (1) is attached to the foam molding machine whose environment has been set as described above, and the data of the mold (1) is stored in a storage device.
If (17b) is stored, the mold number is input. If individual data is input, the optimum data is input from the keyboard (23) to the storage device (17b) as described above.

Next, the mold (1) is closed, and the pre-foamed beads (15) are inserted into the cavity (16) of the closed male and female molds (1a) (1b) through a filler (not shown). Fill. When the filling of the pre-expanded beads (15) is completed, the drain valves (8a) (8b) and the control valves (5a) (5b) of the male and female molds (1a) (1b) are opened, and the steam of the steam source (10) is released. The steam is passed through the steam chambers (2a) and (2b) of the male and female molds (1a) and (1b) to heat the male and female molds (1a) and (1b).

Generally, in this step, since the maximum vapor pressure is supplied, the control valves (5a) and (5b) are fully opened. The steam supplied to the steam chambers (2a) (2b) at the maximum steam pressure is discharged through the drain pipes (20a) (20b), and the molds (1a) (1b)
Is heated and the air and drain in the molds (1a) and (1b) are discharged. During this time, since the drain valves (8a) and (8b) are generally fully opened, the steam pressure in the steam chambers (2a) and (2b) is low and the steam chamber (2a) is operated by the pressure detection devices (4a) and (4b). The vapor pressure in (2b) is not detected. If the drain diameter is small, or if the drain outlet piping is long, a back pressure is generated, and the vapor pressure may be detected.

At this time, since the prefoaming beads (15) in the cavity (16) are hardly heated, the pre-foamed beads (15) (ma4) (ma4) (mb4) The rise is small. However, the cavity components (1a1) (1b
1) temperature (ta3) (tb3) and steam chamber (2a) (2b) temperature (ta1) (tb1)
Since (ta5) and (tb5) have risen, the mold temperature measurement device (ma
3) (mb3), and steam chamber temperature measuring instrument (ma1) (mb1) (ma5) (mb
5) detects the temperature (ta3) (tb3) and the temperature (ta1) (tb1) (ta5) (tb5). At this time, if a plurality of temperature measuring devices (m) are set up and down or left and right, the temperature at each location can be detected, and the temperature distribution can be known.

When the heating of the male and female molds (1a) and (1b) is completed,
Switch to << One-side heating process >> to heat the filled beads (15), discharge air and drain between beads (15),
(15) Uniform expansion is achieved. Here is a male (1a) drain valve
Open (8a), close the male (1a) control valve (5a), close the female (1b) drain valve (8b) and open the female (1b) control valve (5b). After the steam flows from the steam chamber (2b) of the female mold (1b) through the cavity (16) and heats the pre-expanded beads (15) in the cavity (16) at the steam pressure controlled by the flow rate or the feedback, the male mold It enters the steam chamber (2a) of (1a) and flows out of the male (1a) drain valve (8a).

During this time, the pressure in the steam chamber (2b) is detected by the pressure detector (4b) connected to the drain valve (8b). On the other hand, as the heating proceeds, the pre-expanded beads (1
5) swells and the flow of steam becomes worse. In other words, the steam room
The pressure of (2b) gradually increases and is detected, and one-side heating is performed by the above-described feedback control. At the same time, the temperatures (ta2), (tb2), (ta4), and (tb4) of the foam molding (S) are detected.

The mold temperature measuring device (ma3) (mb3) and the steam room temperature measuring device (ma1) (mb1) (ma5) (mb5) also operate in the same manner as described above for the temperatures (ta3), (tb3) and ( ta1) (tb1) (ta5) (tb5) are detected. At this time, if a plurality of temperature measuring devices (m) are set up and down or left and right, the temperature at each location can be detected, and the temperature distribution can be known. Then, these are stored in the storage device (17b). The temperature and vapor pressure are displayed on the display device (24) in a switchable manner as needed.

On the other hand, when the heating step is finished, << reverse one-side heating >> is performed as necessary (in other words, reverse one-side heating may not be performed). In this step, the flow direction is reversed with respect to the flow direction of the one side heating, and the heating of the beads (15) and the discharge of air and drain between the beads (15) are performed as described above, and the further beads (15) are formed. Inflate. Close the male (1a) drain valve (8a), open the male (1a) control valve (5a), and open the female (1b) drain valve (8b) to control the female (1b) When the valve (5b) is closed, steam flows from the steam chamber (2a) of the male mold (1a) through the cavity (16), and the cavity (1
After heating the pre-expanded beads (15) in 6) from the opposite direction, they enter the female-type (1b) steam chamber (2b) and flow out of the female-type (1b) drain valve (8b).

During this time, as described above, the pressure detector (4a) connected to the drain valve (8a) changes the pressure from the steam chamber (2a) to (2b).
The steam pressure of the steam chamber (2a) flowing to the mold is detected and feedback-controlled by the above-described method, so that the reverse one-side heating is performed by the optimal steam pressure in the reverse one-side heating step in the mold (1). . On the other hand, at the end of the heating step, the beads (15) in the cavity are sufficiently foamed to form a foamed molded product (S), and there is almost no steam flow. Then, the process is switched to the next double-sided heating step. During this time, the temperature is simultaneously detected and stored in the storage device (17b). The temperature and vapor pressure are displayed on the display device (24) in a switchable manner as needed.

The double-sided heating step is a step in which the heating temperature is increased by increasing the steam pressure to mainly fuse the surface portion of the foam molded article (S). Male and female mold (1a) (1b) drain valve (8
a) Close (8b) and control valve (5a) for male and female molds (1a) (1b)
(5b) is opened, and steam is supplied to the steam chambers (2a) (2b) of the male and female molds (1a) (1b). In this case, the steam does not flow through the cavity (16), and the foam molding (S) is heated on both sides to sufficiently expand the foam molding.
The beads (15) on the surface of (S) are fused together. At this time, steam does not flow to both drain pipes (20a) (20b), but the pressure detectors (4a) (4b) are connected to the drain valves (8a) (8b) and the steam chambers (2a) (2b) The feedback control of the vapor pressure in the double-sided heating step is performed by the above-described method, and the double-sided heating is performed under the optimum condition. During this time, the temperature is simultaneously detected and stored in the storage device (17b). The temperature and vapor pressure are displayed on the display device (24) in a switchable manner as needed.

When the double-sided heating is completed, the process is switched to the << cooling step >>, and the foam molded body in the cavity (16) is cooled to a predetermined temperature by an appropriate means such as vacuum cooling or water cooling. It is in this cooling step that temperature detection is most effective. That is, when the foamed molded article (S) is opened while the temperature of the foamed molded article (S) is high at the time of cooling and the foamed molded article (S) is taken out, the deformation after the takeout is large and the mold collapses, resulting in a defective product.

On the other hand, if the temperature is cooled down sufficiently,
Although there is no such problem, there are problems that the cooling time becomes too long and the machine cycle becomes longer, and that the consumption of cooling water increases accordingly. It is necessary to take out, and measure the temperature (ta2) (tb2) (ta4) (tb4) of the foam molded body (S) with the foam molded body temperature measuring device (ma2) (mb2) (ma4) (mb4) In addition, when a predetermined temperature is reached, a cooling process such as vacuum cooling or water cooling can be completed, and the process can be shifted to the next process.

The mold temperature (ta3) (Tb3) is measured by a mold temperature measuring device (ma3) (mb3), and when a predetermined temperature is reached, a cooling process such as vacuum cooling or water cooling is completed. May be.

In general, the mold is opened at a place where the temperature has reached a predetermined value, the foamed molded product (S) is taken out, and the molding is completed. By repeating such a cycle, the foam molding
The molding of (S) is performed, but the lot is completed,
Die exchange is performed before changing to the next lot. At this time,
The data including the mold number of the replaced mold or the ideal temperature data of each process of the mold as described above
It is driven into the storage device (17b) via (23) to start the foam molding operation.

If defective products continue during the operation, the temperature measurement data (Ta1) to (Tb5) of the defective product operation are called on the display device (24), and the ideal curves (θa1) to (θb5) are read. ), Determine the cause of the failure, and adjust the vapor pressure setting.

[0060]

As described above, according to the present invention, the temperature of the cavity constituting part of the mold, the temperature inside the mold,
Alternatively, by measuring the temperature of the foamed molded article and displaying it visually, for example, in a graph, or by comparing and displaying the reference temperature and the measured temperature data at the time of molding a non-defective product, a great skill is obtained. This eliminates the need to determine the conditions at the time of mold replacement and to immediately investigate the cause of defects occurring during molding.

[Brief description of the drawings]

FIG. 1 is a piping diagram including a control circuit according to the present invention.

FIG. 2 is a display drawing of a mold steam pressure and a temperature change in the present invention, wherein (a) is a drawing drawing of a female mold steam pressure;
(b) is a display drawing of the male mold steam pressure, (c) is a temperature change graph, and (d) is a drawing in which both the mold steam pressure and the temperature change are displayed in a superimposed manner.

FIG. 3 is a graph in which a deviation between reference temperature data and temperature measurement data in the present invention is graphed based on reference temperature data.

FIG. 4 is a diagram in which a reference temperature data graph and a temperature measurement data graph according to the present invention are superimposed and displayed.

[Explanation of symbols]

(1)… Die (1a)… Male (1b)… Female (1a1) (1b1)… Cavity component (2a) (2b)… Steam chamber (3a) (3b)… Steam piping (4a) ( 4b) Pressure detector (5a) (5b) Control valve (6a) (6b) Switching valve (7a) (7b) Drain hose (8a) (8b) Drain valve (9a) (9b) Drain Piping from hose to drain valve (10)… Steam source (11a) (11b) (11a ') (11b')… Bilot piping (17b)… Storage device (20a) (20b)… Drain piping (cont)… Control unit (m): Thermometer (ma1) (mb1) (ma5) (mb5): Steam room temperature measuring device (ma2) (mb2) (ma4) (mb4): Foam molded body temperature measuring device (ma3) (mb3): Mold temperature measuring device (S): Foam molded body (ta2) (tb2) (ta4) (tb4): Temperature of foam molded body (ta3) (tb3): Temperature of cavity forming part of mold ( ta1) (tb1) (ta5) (tb5)… Temperature of steam room (Ta1) ～ (Tb5)… Temperature signal or temperature measurement data from thermometer

[Procedure amendment]

[Submission date] June 5, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The steam pipes (3a) and (3b) are connected to the male and female molds (1) through steam side hoses (14a) and (14b).
a) The steam side bases (13a) (13) provided in (1b)
b) .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

The pilot pipes (11a) (11b) connected to the pressure detectors (4a) (4b) are pipe sections between the drain hoses (7a) (7b) and the drain valves (8a) (8b). (9a) (9b), or drain valve at the upstream side of the valve body (8a) is connected to (8b) itself, steam chamber (2a) (2b) in the drain valve to match the vapor pressure of (8 a) ( detecting a pressure of 8 b) in, and to feed the analog signal to the analog input interface of the control unit to be described later in place of the analog signal (cont) (17d). Of course, the connection positions of the pilot pipes (11a) and (11b) are not limited to the positions described above, and they may be directly connected to the steam chambers (2a) and (2b) as in the related art.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

Temperature measuring device (m) mounted on mold (1)
Is, in this embodiment, the detection portion into the cavity (16) of the mold (1) is arranged to be exposed, the temperature of the foamed molded in the cavity (16) (S) (ta2) (tb2) ( ta4) (tb
4) Thermometer for foamed molded article (ma2) (m
b2) (ma4) (mb4), or cavity component (1a1) of mold (1)
A mold temperature measuring device (ma3) (mb3) for measuring the temperature (ta3) (tb3) of (1b1), or the temperature (ta1) (tb) of the steam chamber (2a) (2b)
1) A steam chamber temperature measuring device (ma1) (mb1) (ma5) (mb5) for measuring (ta5) (tb5).

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

As shown in the figure, all of these temperature measuring devices (m) may be provided, but only one of them may be used, or a combination of and / or may be used. Further, one of the temperature measuring devices (m) may be provided one by one, or a plurality of the temperature measuring devices (m) may be provided, and a plurality of temperature measuring devices (m) may be measured at different locations at different positions of the mold (1).
When installed vertically, the temperature distribution above and below the mold (1) or the foamed article (S) can be understood. The temperature measuring device (m) is provided with (a) the temperature (ta2) (t) of the foam molded body (S) in the cavity ( 16 ) depending on the installation location.
b2) (ta4) (tb4), (b) Temperature (ta3) of cavity components (1a1) and (1b1) of mold (1)
(Tb3), (c) or measuring the temperature (ta1) (tb1) (ta5) (tb5) of the steam chamber (2a) (2b),
A temperature measurement analog signal (Ta1 ') is input to an analog input interface (17d) of a control unit (cont) described later.
~ (Tb5 '). ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 11, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (7)

[Claims] At least one of a temperature of a cavity component of a mold, a temperature of a steam chamber, and a temperature of a foam molded article in a foam molding step is measured, and the temperature measurement data is stored and called up at any time to visually recall. A method for measuring and displaying a temperature in a foaming molding process, wherein a characteristic display is provided. 2. The method according to claim 1, wherein reference temperature data of at least one of a temperature of a cavity constituting portion of the mold, a temperature of the steam chamber, and a temperature of the foam molded body in the foam molding process is stored in advance. Measure at least one of the temperature of the cavity constituent part or the temperature of the steam chamber or the temperature of the foam molded body, compare the reference temperature data with the measured data, calculate the deviation thereof, and store the deviation, as needed. A method for displaying and displaying a temperature in a foaming molding process, wherein the method is called and a visual display is performed. 3. The method for measuring and displaying a temperature in a foam molding step according to claim 1, wherein visual display is performed by making a graph. 4. The method for measuring and displaying a temperature in a foam molding step according to claim 1, wherein the measurement is performed at a plurality of points on the mold. 5. The temperature measurement in the foam molding process according to claim 1, wherein an alarm is issued when the measured temperature exceeds an allowable range, and the operation is stopped when the measured temperature exceeds an allowable limit. Display method. 6. A foam molding die having a steam chamber, and a temperature measurement for the foam molding which is disposed so that a detection portion is exposed in a cavity of the mold, and measures a temperature of the foam molding in the cavity. A mold, a mold temperature measuring device for measuring the temperature of the cavity component of the mold, or at least one of a steam room temperature measuring device for measuring the temperature of the steam room, and a temperature signal from the temperature measuring device. A foam molding machine comprising: a storage device for taking in and storing; and a display device for retrieving temperature measurement data from the storage device and displaying a temperature change. 7. The apparatus according to claim 6, further comprising an alarm mechanism for issuing an alarm when the measured temperature exceeds an allowable range, and for stopping operation when the measured temperature exceeds an allowable limit. The foam molding machine as described.