JPS61259482A - Control of surface temperature for heat plate, die or the like - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for controlling the surface temperature of a hot plate, a mold, etc. In order to accurately and uniformize the surface temperature of a hot plate, mold, etc. (hereinafter referred to as a hot plate, etc.) fitted into a hot plate, etc., the distribution state of the surface temperature (2 or less is the same excluding the back and side surfaces) is The present invention relates to a temperature control method that can easily obtain a uniform surface temperature without the trouble of measuring temperature at multiple locations and controlling (adjusting) the temperature each time.

<Prior art> Conventionally, in order to equalize the surface temperature distribution of a hot plate etc. in which a plurality of heaters of the same type and structure are fitted in multiple rows and multiple stages, the method shown in Fig. 6 is used. In order to increase the temperature of the surface of the hot plate etc. 1, that is, the corresponding surface of the fitted heater 2, as much as possible, for example 3a, 3b.

3c, 3d, 3e, -3n (in this figure, 3a to 3e), etc., the temperature is measured over the entire surface, and each time the temperature is controlled to the desired temperature via a temperature control device (not shown). Alternatively, it is commonly used and known to obtain as uniform a surface temperature distribution as possible by, for example, installing multiple devices.

<Problems to be Solved by the Invention> However, in this method, a plurality of the heaters are arranged symmetrically on the hot plate and at equal intervals in each stage (see FIG. 6).
In order to uniformly control the surface temperature of the hot plate even in such cases, it is necessary to select as many temperature measurement points as possible over the entire surface of the hot plate, measure the temperature at each point, and control the temperature each time. Alternatively, installing multiple temperature control devices, etc. was effective in making the temperature distribution uniform, but on the other hand, it not only made the operation complicated, but also caused time loss and temperature control devices etc. This was by no means a good idea as it led to an increase in equipment costs due to heavy use of equipment or increased size of equipment.

Moreover, the arrangement of these heaters is (a) symmetrical as described above, but at unequal intervals for each stage, or (a)
(b) In cases where the facing portions of the heaters (between end faces) are unequal intervals in each stage and alternately, and (c) In the case where both the facing parts between the heaters and the intervals between each stage are unequal intervals. In addition to being complicated in terms of ml, this method is accompanied by the inconvenience of increasing time loss and further increasing the cost of tin installation.

〈Means for solving problems〉 Here, the present inventor has provided the above-mentioned (a) and (b).

As a result of intensive research to solve the problems in (c), we found the isomorphism.

Multiple rows of heaters with the same structure on the hot plate (symmetrical) as described above? ! When installed in several stages, there is a first layer on the surface of the hot plate.
Vertical line X that divides the surface into four equal parts as shown.

When horizontal lines Y are ruled perpendicularly and the intersection point is set to 0, when displaying the positions of sections A, B, C, and D that are arranged in parallel vertically and horizontally, the temperature distribution state of only the surface of one of them, for example, section A, is taken as a reference. Same as before, at multiple locations 3a, 3b, 3c, 3
d, ・3n (tems 3a, 3b, 3c in this figure), etc., and control the temperature as necessary to make the surface temperature distribution of only the section A uniform, and at the same time, measure the temperature of the remaining sections B,
Regarding C and D, if the temperature-controlled part of section A is 3b, then the corresponding section 8. C.

When only each 3b of D was controlled to the same temperature as that of the section A, the standard section A and the remaining section B.

It turns out that there is the following relationship between C and [). In other words, ■When section A is turned over to the right side with vertical line do.

(2) When section C is turned over over section A with horizontal line Y as the boundary, both sides, including the heater position, match completely, and the surface temperature of section C matches that of the section.

■The compartment is 1il matches that of section A.

Therefore, based on the above confirmation, the present inventor conducted further research, and as a result, the inventors selected a large number of locations as described above only for the compartments, and measured the temperature through temperature measurement m (not shown) linked to the temperature control device. If the surface temperature distribution of section A is made uniform by temperature measurement (temperature control as necessary), sections B and C.

For D, by controlling the temperature only in the area corresponding to section A, the surface temperature distribution of each of the remaining sections B, C, and D, which are fitted with heaters of the same type and structure as section A, will be the same as section A.
The present invention was completed based on the discovery that the same result could be obtained by reliably transferring the above.

The above explanation is about the case where multiple heaters of the same type and structure are fitted (arranged) on a hot plate as described above, but it is not limited to a hot plate, and can be applied to a mold (including a core and a cavity). It has been confirmed through experiments by the inventor that similar results can be obtained with the plate.

That is, when such a heater is fitted into a mold in the same way as a hot plate, sections A and B are formed on the surface of the mold, similar to the hot plate.

Display the positions of C and D with ruled lines, check the surface temperature using section A as a reference in the same way as a hot plate, and if there are any points that require control, control them as described above, and then adjust the remaining sections B, C, and D to the section. By controlling only the temperature corresponding to the points that need to be controlled, the surface temperature distribution of the mold will be in section 8. Uniformize including C and D.

This means that on a hot plate, etc., the 8 degree distribution of section A is 150 degrees.
℃, the surface temperature can be obtained as an average of 150℃±2℃, which is a very approximate value (Example, 1st
~See Table 2).

However, in this case, the temperature distribution in reference section A (150°C)
On the other hand, if the surface temperature a (average) of the hot plates, etc. in the remaining sections [3, C, and D is less than 148°C or higher than 152°C, those hot plates, etc. are applied to a known molding machine. When molding materials such as resins are subjected to hot pressure molding, stress cracking or deformation of the molded product is likely to occur due to the generation of internal stress due to the temperature difference with respect to the required temperature and the imbalance between the molding pressure, which is unsuitable. Therefore, in the present invention, the temperature essential for consistently obtaining good quality products is set to an average of 150°C±2°C.

As mentioned above, the gist of the present invention is to provide a hot plate or the like in which a plurality of heaters of the same type and structure are fitted in multiple rows and stages.
The heaters are fitted on the hot plate or the like so as to be symmetrical laterally or vertically, and the surface of the hot plate or the like is divided into four equal sections A and B arranged vertically and horizontally.

C1D is displayed with ruled lines, and the surface temperature of section A is measured at various places with section A as a reference, and the temperature is controlled as necessary to make the surface temperature of section A uniform. A method for controlling the surface temperature of a hot plate, etc., such that the control temperature of the heater becomes the temperature of each corresponding part of the remaining sections B, C, and D. (hereinafter referred to as vertical spacing) are unequal intervals for each section and for each tier, or the facing portions (between end faces) of the heater are unequal intervals for each section and alternately for each tier, or This includes the case where both the upper and lower intervals are unequal for each section.

An object of the present invention is to provide a plurality of rows of the plurality of heaters.

In a hot plate etc. fitted in multiple stages, the vertical spacing of the heaters is unequal for each stage, or the facing part of the heater is unequally spaced alternately for each stage, or the vertical distance between the facing part of the heater and each stage. Even if they are fitted (arranged) at unequal intervals (each compartment), it is possible to effectively equalize the surface temperature distribution of the hot plate, etc., reducing the complexity and time involved in temperature measurement. It is an object of the present invention to provide an economically advantageous method for controlling the surface temperature of a hot plate, etc., without any loss of performance or increase in equipment costs.

<Function> The function of the present invention will be described below with respect to a hot plate.

Now, a plurality of heaters 2 of the same type and structure are installed on the hot plate 1.
4. When fitted as shown in the figure, the surface of the hot plate 1 has sections A, B, C, and D dividing the surface into four equal parts according to the above description.
(see Figure 1), since section A overlaps and matches B, C, and D, naturally the position of the heater fitted in the deflected section also matches (see
(See ~■) Therefore, using A as a reference section, measure only that section at multiple locations (however, if temperature measurement is performed in conjunction with related equipment, it is better to average the value from an appropriate number of times), If there is a non-uniform area, the temperature at that area is controlled to the desired temperature using a conventional method, and after making the surface temperature of the standard compartment A uniform, the standard area is adjusted for each of the remaining compartments B, C, and D. Uniformity of the surface temperature of the hot plate can be ensured by simply matching the temperature at the location corresponding to the compartment with the dust control temperature for the compartment, regardless of the uneven spacing of the heater arrangement at each point. It is possible.

Furthermore, in the present invention, if the temperature measurement result of only the surface of the reference section A is determined to be uniform, the result will be the same as if the temperature were transferred directly to the temperature of the sections B, C, and D. This means that the inn of only the reference section that occupies the area of the area is sufficient.

However, the inventor's experiments have revealed that the above-mentioned points work in exactly the same way even in the case of molds (see Tables 1 and 2).

<Effects of the Invention> Since the present invention exhibits the following unique effects, it is of great practical benefit to related industrial fields.

(1) The present invention provides a hot plate or the like in which a plurality of heaters of the same type and structure are fitted in multiple rows and multiple stages, in which the heaters are located symmetrically in each row, and their facing portions (end face spacing) ) are unevenly spaced on each stage, or the vertical spacing of the heaters is uneven on each stage and alternatingly, or the facing part of the heater and the vertical spacing of each stage are both unevenly spaced (both by section). However, when displaying divisions A, B, C, and D that divide the hot plate surface into four equal parts regardless of the irregular intervals, division A and the remaining divisions [3, C, and D are already As mentioned above, since there is a polymerization coincidence relationship, the state of the surface temperature distribution is measured using section A as a reference as described above, and non-uniform temperatures are controlled (adjusted) to determine the surface temperature distribution of reference section A. After making it uniform, the remaining sections B, C, D
By controlling only the temperature of the corresponding part of the reference section A to the control temperature of the section A, uniformity of the surface temperature of the hot plate, etc. can be achieved.

Furthermore, in the present invention, if the surface temperature measurement results for the reference compartments are uniform, the surface temperatures of compartments B, C, and D can be obtained as the same temperature as that of compartment A, so there is no need for temperature measurement. There is no need to uniformly measure the surface temperature of a hot plate, etc. at various locations to control the temperature, or to use many temperature control devices, so there is no need to worry about temperature control and time loss. It is extremely advantageous from an economic point of view.

(2) Furthermore, as described above, the present invention can extremely effectively obtain uniformity in the surface temperature distribution of a hot plate, etc., so when applying such a hot plate, etc. to a molding machine to heat mold a molding material, The uniform surface temperature of the plate, etc. prevents the occurrence of internal stress that is likely to occur during hot pressing, and prevents stress cracking and deformation of the product.
Physical.

It has the effect of having good chemical or mechanical performance.

<Example> The present invention is illustrated in which the same parts are given the same reference numerals, that is, FIG. of,
Fig. 2 shows the inside of the heating plate shown in Fig. 1, and Fig. 3 shows the case where the heaters are fitted symmetrically on the heating plate, and the facing parts (between the end faces) are arranged alternately for each section and for each stage. In the case of incorrect spacing.

Figure 4 is a plan view showing a case where the heaters are symmetrical, but the facing parts and the vertical intervals of each stage are both inappropriate for each compartment (However, Figures 3 and 4 are cross-sectional views similar to Figure 2). 1 is a hot plate,
Reference numeral 2 denotes a heater of the same type and structure that is fitted into a plurality of through holes (not shown) drilled horizontally and at irregular intervals from one end face of the hot plate 1 in the opposite side direction. It's not particularly different.

In FIG. 1, there is a straight line (orthogonal) X on the surface of the hot plate 1 that divides the surface into four equal parts as described above.

Sections A, B, and C are arranged horizontally, vertically, and vertically through Y.

After indicating the position D as shown in the figure, energize each heater 2 at the same time and watch when the hot plate surface temperature rises to the desired temperature (approximately 150°C). For example, 3a.

3b, 3c, -3n (in this figure, 3a, 3b, 3c), etc., are measured using a conventional method, and as a result, for example, the temperature measurement value at 3b is compared to that at 3a and 3c, and the temperature is in a higher or lower temperature range. If there is a deviation, the temperature at point 3b is controlled via a temperature control device (not shown) to match 3a and 3c (control m+temperature is shown as 3b').

Once the surface temperature distribution in the reference section has been made uniform in this way, the remaining sections B, C, and D can be controlled in the same manner as described above so that the temperature at the corresponding location 3b of section A becomes 3b'. , the desired uniformity of the surface temperature of the hot plate 1 is ensured.

This can be seen in Figure 2 (the cross section of Figure 1 is not shown) as a hot plate: 70011X 50011X 1501111
section A, on the surface of the hot plate as described above.
B.

C and D are displayed with ruled lines, and the surface temperature of each section is measured in the same manner as above, using the section as a reference section, and after controlling non-uniform temperatures to make the surface temperature uniform, the remaining sections B,
For C and D, the temperature at each point corresponding to the section was controlled to the control temperature of section A, and II was arbitrarily set at various points on the surface of the hot plate, and the measured temperature value was an average of 147.8 degrees Celsius.
It was confirmed that the desired temperature was 150°C±2°C at ~152°C. However, the above results are obtained for the configuration shown in Figure 2 (the heaters are arranged at unequal intervals above and below), but the configuration shown in Figure 3 (the facing parts of the heaters in Figure 2 are alternately spaced at unequal intervals). As for the configuration shown in the fourth figure (both the facing portions of the heater and the vertical spacing are unequal), good results were obtained as in the case shown in the second figure, and both were satisfactory (see Table 1).

Next, Fig. 5 (cross-sectional view) shows an example in which a mold is used.
To explain based on this, the mold 5 consists of a core 6 and a cavity 7 as shown in the figure, and the core 6 and the cavity 7 have through holes 4, 4, .・are provided opposite each other as shown in the figure. Next, after fitting the heater 2 into each of the through holes 4 in the same manner as shown in FIG. ), and after simultaneously energizing each heater, 211
After controlling the IIJ for 1 m to make the surface temperature uniform,
The controlled temperature is controlled to the temperature of the corresponding portions of the remaining sections B, C, and D. In this way, the surface temperatures of the fur and the cavity can be made uniform.

However, even when the heater 2 had the configuration shown in FIGS. 3 and 4 shown in the previous example, the same desired results were obtained as described above (see Table 2).

(Additional notes) 1) Heater configurations (1), (2), (
3) is the second. Third. The heater configuration (1) in Table 2 shows the case of the configuration shown in FIG. 4 (the above-mentioned hot plate).

(2) and (3) show the case of the configuration shown in the fifth figure (mold).

2) After control shown in reference section A and sections B, C, and D ("
C) is the surface temperature of the hot plate and the mold (heater fitting), when the temperature in the relevant section is randomly measured (at 5 points) under the same conditions after controlling the temperature at the points that require control (WA adjustment). The average value ('C) is shown.

3) A comparative example shows a case where a conventional method was applied (temperature measurement and control at point 1b) to a hot plate and a mold (both were fitted with a heater).

4) O: No stress cracking or deformation is observed in the product (after 3 months) (good product) ■: The product is good, but temperature measurement and control are complicated and take a lot of time, which is undesirable. Products with stress cracking or deformation (defective products)

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view showing four divisions with ruled lines on the surface of a hot plate on which heaters are fitted symmetrically and with irregular vertical intervals for each division; The figure is a plan view showing the inside of the heating plate in Figure 1, and Figure 3 is a plan view showing the inside of the heating plate, and Figure 3 shows that the heaters are located symmetrically on the heating plate, and the hF spacing is inappropriate for each section and each stage, and the opposing parts are alternately arranged. Fig. 4 is a cross-sectional plan view showing a case where the heaters are located symmetrically on the hot plate, but the vertical spacing and the facing portion of each section and each stage are both inappropriately spaced. FIG. 5 is a vertical sectional side view of a mold in which heaters are fitted symmetrically and with irregular vertical intervals, and FIG. 6 is a plan view of a hot plate showing a conventional example. 1... Hot plate, 2... Heater, 3a, 3b
...3n...2 temperature measurement points, 3b'...control temperature. 4...Through hole, 5...Mold, 6...Core. 7...Cavity. Figure 1 Figure 3 Figure 2 Figure 4

Claims (4)

[Claims] (1) In a hot plate or mold, etc., in which a plurality of cartridge heaters of the same type and structure are fitted in multiple rows or stages, the cartridge heaters are fitted to the hot plate or mold, etc. so that they are symmetrical left and right or vertically. The surface of the hot plate or mold is divided into quarters and arranged in rows and columns A, B,
C and D are displayed with ruled lines, and the surface temperature of section A is measured at various locations with section A as a reference, and the temperature is controlled as necessary to make the surface temperature of section A uniform. A method for controlling the surface temperature of a hot plate, a mold, etc., characterized in that the control temperature of A is controlled to be the temperature of each corresponding part of the remaining sections B, C, and D. (2) The method for controlling the surface temperature of a hot plate or mold according to claim 1, wherein a plurality of cartridge heaters located in bilaterally symmetrical positions are arranged at unequal intervals for each section and for each stage. (3) The surface of the hot plate or mold according to claim 1 or 2, wherein the facing portions of a plurality of symmetrical cartridge heaters are arranged at unequal intervals for each section and for each stage. How to control temperature. (4) The hot plate or mold, etc. according to claims 1 to 3, wherein the facing portions of the plurality of cartridge heaters located in bilaterally symmetrical positions and the intervals between the stages are both unequal intervals for each section. How to control the surface temperature of.