JPS6350662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for calculating the time at which the torque value of rubber during vulcanization reaches a predetermined value.

In general, a vulcanization degree tester measures the waveform of the torque value (stress when a constant rotation angle is applied) of the rubber during vulcanization over time, that is, the waveform drawn by the solid line in Figure 1 (torque value output). It is a very convenient device for checking the state of vulcanization of rubber, etc., as it can obtain the waveform (signal waveform) and the waveform drawn by the dotted line in the same figure (the waveform of only the upper peak value of the solid line waveform). Since data appears on recording paper, the necessary data must be read and calculated from that recording paper.
When processing data using a number of measurement devices like this, it is extremely burdensome for the host computer because the data is not output in an organized manner as described above. Although such measuring devices basically provide data on viscoelasticity, the problem is that they are not used much because the data processing is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus that can easily determine the time at which a torque is generated at an appropriate ratio. Hereinafter, this invention will be explained in detail based on one embodiment shown in FIGS. 2 to 5.

In Fig. 2, 2 is the vulcanization degree tester mentioned above, which starts operating at the same time as the start of vulcanization of the rubber.
Generates an output signal as shown in the figure. This output signal is amplified by the amplifier section 4 and then supplied to the sample-and-hold conversion section 6. The output signal of the vulcanization tester 2 is also supplied to the peak detection section 8,
The peak detection section 8 is composed of, for example, a differentiating circuit, and generates a detection signal every time it detects each upper peak value of the output signal of the vulcanization tester 2. Every time a detection signal is generated, the sample-hold A/D converter 6 digitally converts the output signal of the amplifier 4 (an amplified peak value of the output signal of the vulcanization tester 2) and sends it to the computer. supply to 10;
Computer 10 sequentially stores these digital values. At the same time, the computer 10 stores the time measurement value of the time measuring section 12, which started operating at the same time as the vulcanization tester 2 started operating, every time a detection signal is generated. Therefore, these stored values represent the times at which the respective peak values of the output signal of the vulcanization tester 2 occur with reference to the time when the vulcanization tester 2 starts operating.

In parallel with storing each digital peak value and the time of occurrence of each peak value, the minimum value of each peak value is stored.
A search for T _MIN is performed. This search sequentially judges whether or not the digital peak values stored in sequence are smaller than the minimum digital peak value stored up to that point, and if it is smaller, the above judgment is made for the next digital value as well. If the digital value is larger, the digital value immediately before that digital value is determined to be the true minimum value T _MIN . For example, when the digital value of peak value 14 shown in FIG. It is determined that it is the minimum value in . When the next digital value of peak value 18 is stored, this peak value 18 is also the peak value 1 that was previously determined to be the minimum value.
Since it is smaller than 6, this peak value 18 is determined to be the current minimum value. When the digital value of peak value 20 is stored, this peak value 2
Since 0 is larger than the peak value 18 which was previously determined to be the minimum value, the peak value 18 is determined to be the true minimum value T _MIN .

After the search for the minimum value T _MIN is completed, the search for the maximum value T _MAX is performed in parallel with the storage of the digital value of each peak value. In this search, when a peak digital value is stored, it is determined whether this digital value is larger than the maximum value of the previously stored digital values, and if it is larger, the same judgment is made for the next digital value. If the digital value is smaller, the digital value immediately before that digital value is determined to be the true maximum value T _MAX .
For example, if the digital value of peak value 22 shown in FIG. 1 is stored, this is greater than the maximum peak value 24 of the previously stored peak values, so
It is determined that this peak value 24 is the current maximum value. When the digital value of the next peak value 26 is stored, this peak value 26 is also larger than the peak value 22 previously determined to be the maximum value, so this peak value 26 is determined to be the current maximum value. When the peak value 28 is stored, this peak value 28 is smaller than the peak value 26 previously determined to be the maximum value, so the peak value 26 is set as the true maximum value T _MAX
I judge that.

When the search for the maximum value T _MAX and minimum value T _MIN is completed, the computer 10 determines the torque value T ₉₀ corresponding to the ratio set in the setting device 30, for example, 90%.
Calculate. Note that this 90% means that the minimum value T _MiN is 0.
% and the maximum value T _MAX is taken as 100%, so the calculation formula is T ₉₀ = T _MIN + 0.9 (T _MAX − T _MIN ).

When the calculation of T ₉₀ is completed, the computer 10 calculates the value from among the digital values of each peak value stored.
Select the digital value T Z1 that is smaller than T ₉₀ and has the closest peak value (32 in Figure 1), and select the digital value T _Z2 that is larger than T ₉₀ and has the closest peak value (24 in Figure 1 ₎ . , and torque generation times t _Z1 and t _Z2 corresponding to T _Z1 and T _Z2 are selected.

Then, the computer 10 sets T _Z1 and T _Z2 as y coordinates, sets t _Z1 and t _Z2 as X coordinates, and sets (t _Z1 , t _Z1 ) and t _Z2 ,
Calculate the linear equation y=T _Z1 +T _Z2 −T _Z1 /t _Z2 −t _Z1 (X−t _Z1 ) connecting t Z2 ), and use _this linear equation to find the time t ₉₀ when y becomes T ₉₀ .
Calculate. Figure 3 shows the flowchart for calculating _t90 . Calculated t ₉₀ , maximum value
T _MAX and minimum value T _MIN are displayed on display section 32 and printer section 3.
4 will be displayed.

Note that depending on the rubber to be vulcanized, the torque value may continue to increase indefinitely without reaching the maximum value, but in preparation for such a case, in this example, the maximum elapsed time is set using a timer, etc. If the maximum value T _MAX is not obtained when the maximum elapsed time is reached, the torque value at that time is treated as the maximum value T _MAX .

In this embodiment, in addition to being able to calculate the time when the torque value reaches the predetermined ratio, it is also possible to obtain data regarding the deviation between the actual torque value generation angle and the maximum rotation angle. That is, the angle at which the torque value is generated and the maximum rotation angle should originally match, but since rubber has viscoelasticity, there is a deviation between the two angles. The degree of this deviation is shown in a graph in FIG. 4, where (a) shows the angle of occurrence of the torque value (stress), and (b) shows the rotation angle (displacement). Therefore, a proximity switch is provided at the position of the maximum rotation angle of the rubber in the vulcanization degree tester 2, and a pulse signal generated by this proximity switch every time the rubber reaches the maximum rotation angle position is converted into a pulse signal by the waveform shaping section 40 shown in FIG. The time x from when the initial pulse signal is supplied until the peak detector 8 generates a detection signal, and the time x from when the initial pulse signal is supplied until the next pulse signal is supplied. The difference between the peak torque generation time and the maximum rotation angle time is calculated by calculating y-x.
Find t _s , and y is the maximum rotation angle 1 cycle time t _c
The deviation δ in both angles from t _s and t _c is calculated using δ = 360° x t _s /t _c . A flowchart for determining the deviation δ between both angles is shown in FIG. Note that δ is not calculated only once, but is calculated sequentially. Further, although δ was determined based on the difference between the time when the maximum angle is reached and the time when the peak torque value is reached, it can also be determined using the difference between the time when the angle becomes 0 and the time when the torque becomes 0.

According to the method and apparatus according to the present invention, it is possible to automatically determine the generation time of a torque value of a predetermined ratio, whereas conventionally it took time to read and calculate the necessary data from a recording paper. It is convenient because it can be known, and it is especially effective when many vulcanization degree testers are operated.

In the above embodiment, only the upper peak value was detected, but the lower peak value or both upper and lower peak values may be detected. When reading both sides, the input value to the computer 10 needs to be an absolute value. Furthermore, although the ratio is set to 90%, other ratios may be set, and the number of settings does not need to be one.If a digital switch is used in the setting device 30, the user can arbitrarily change the setting value. It is convenient because it can be done. Furthermore, t ₉₀ was calculated using (T _Z1 , t _Z2 ) and (T _Z2 , t _Z2 ), but it is not practical to use the occurrence time of the value close to t ₉₀ of T _Z1 or T _Z2 as t ₉₀ . There isn't.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the output signal of the vulcanization tester used in the present invention, Fig. 2 is a block diagram of the torque generation time calculation device according to the invention, and Fig. 3 is a flowchart showing the method for calculating the torque generation time. , Fig. 4 a and b are diagrams showing the deviation between the rubber torque value generation time and the maximum rotation angle time, and Fig. 5 is a flowchart showing a method for determining the deviation between the rubber torque value generation angle and the maximum rotation angle. It is. 2... Vulcanization degree tester, 8... Detection section, 10... Computer, 12... Time measurement section.

Claims (1)

[Scope of Claims] 1. A process of sequentially storing each peak value of a signal generated by a vulcanization degree tester representing fluctuations in the torque value of rubber during vulcanization and the time at which each of these peak values occurs, and this storage. A process of searching for the minimum value of the peak values and the time of occurrence of the minimum value in parallel with the process; a process of searching for the maximum value of the peak values and the time of occurrence of the maximum value in parallel with the storage process; and the process of calculating a torque value corresponding to a predetermined ratio based on the peak value and the maximum value, and the process of calculating the torque value corresponding to a predetermined ratio based on the peak value stored above, and the closest peak value that is larger than the above calculated value, its occurrence time, and the above calculated value. A torque generation time calculation method comprising the steps of searching for the smallest and closest one and its generation time, and calculating the generation time of the calculated torque value based on these search values and the calculated torque value. 2. A detection circuit for each peak value of the signal from the vulcanization degree tester that represents the fluctuation in the torque value of the rubber during vulcanization, a time measuring device for measuring the time from the start of vulcanization, and A function to read the signal of the vulcanization tester and the output of the time measuring device each time the detection circuit generates a detection signal, and to read the maximum and minimum values of the read signal of the vulcanization tester. A function to select, a function to calculate a torque value corresponding to a predetermined ratio based on the above maximum value and minimum value, a function that is larger and closest to the above calculated torque value among the signals from the vulcanization tester read above. A function to search for a thing and its occurrence time and a thing smaller and closest to the above calculated torque value and its occurrence time, and a function to calculate the occurrence time of the above calculated torque value based on these search values and the above calculated torque value. A torque generation time calculation device comprising a calculator.