JPS58147326A - Detecting method of trouble in injection molder - Google Patents

Abstract

PURPOSE:To enable improving of accuracy of a molded work, saving of a labor, and reducing of a manufacturing cost, by detecting a trouble on a machine under a molding process through monitoring of a clamping time, an injecting primary pressure time, a weighing time and a molding cycle time. CONSTITUTION:A clamping time, an injecting primary pressure time, and a one cycle time are measured in order by a counter 1, and the measuring times are inputted in a memory part 2 and a comparing part 3. Further, each motion stroke time is monitored at the comparing part 3 by means of data of timers 6 and 7 determined from a preceding reference time. If one molding cycle is completed, each motion stroke time of a current molding cycle serves a reference time for a following molding cycle, and when a partial motion stroke time in one molding cycle deviates from a data of a timer, the occurrence of a trouble is detected.

Description

[Detailed Description of the Invention] This invention relates to a method for detecting abnormalities during molding.
The purpose is to monitor the mold clamping time, injection time, metering time, molding cycle time, etc. to detect abnormalities in the machine during the molding process, and also to control the quality of the molded product.

The present invention according to the above-mentioned object has a normal operation stroke time of 1
Measure and memorize each molding cycle, set the upper and lower allowable time limits using the memorized previous operation stroke time as the reference time, and compare the actual measured time and the reference time within the range of the upper and lower allowable time limits. Detects an abnormality in the machine, fixes the above reference time in the memory, calculates the standard time by adding or subtracting the allowable up and down time from the reference time, and compares the standard time with the actual measured time of each operation stroke. and detecting machine abnormalities.

The present invention will be explained in detail below using illustrated examples.

1 is a counter that actually measures each process time and molding cycle time required for molding, and the measured time is input into the storage section 2 and the comparison section 3. The above comparison section 3 is a time-over controller/
4 rater 3a and a time under comparator 3b.

Data from the storage section 2 is inputted to the comparators 3a and 3b through an adder 4 and a subtracter 5, respectively.

Further, a timer 6 for time over monitoring is connected to the controller 3a, and a timer 7 for time under monitoring is connected to the controller 3b.

The timer 6.7, the adder 4, and the subtracter 5 are connected by a switch F between the counter 1 and the storage section 2.
It can be switched together with 2. 8
indicates range.

Therefore, in the illustrated state, the mold clamping time, injection time, measuring time, one molding cycle time, etc. are sequentially measured by the counter 1, and the measured times are input into the storage section 2 and the comparison section 3. . Further, in the comparator 3, each operation stroke time is monitored based on the data of the timer 6.7, which is determined based on the previous reference time.

When one molding cycle is completed, each stroke time of the current molding cycle newly input to the storage unit 2 becomes the reference time for the next molding cycle, and each operation stroke time is monitored by timer data. become. As a result, the occurrence of an abnormality is detected when a part of the operation stroke time in one molding cycle deviates from the timer data.

In addition, since the actual measured time of each operation process is inputted into the storage unit in units of one molding cycle, the molding cycle time when an abnormality occurs during molding will not be stored as the reference time, and the next The time in the molding cycle is stored as a reference time.

This also applies when changing part of the operation stroke time during the molding process, and even if the new operation stroke time is input into the storage unit 2 midway through, the molding cycle time at that time remains the reference time. Instead, the next one molding cycle time is stored as a reference time and monitoring is continued.

Further, when the switch F is turned off, the adder 4 and the subtracter 5 are turned on, and the switch F2 is turned off at the same time, the process enters a sampling lock state, and the previous molding cycle time remains as the reference time.

The range setting value is added/subtracted to this reference time, and this is K.
It is compared with the time data measured by the counter 1 as standard time data for each operation stroke time. Then, an abnormality is detected when each operation stroke time deviates from the range setting value, that is, the vertical allowable time.

In the above monitoring process, the reference time is set at the end of each molding cycle, so the reference time as data is the reference time for the next molding cycle time (as long as it changes within a range that does not deviate from the timer data). Can be used as As a result, as shown in Figure 2, the temperature of the pressurized oil increases over time, and the monitoring of the machine and the molded product are compared in the case where the temperature of the pressure oil increases over time, and changes occur in each operation 1 hour A according to the temperature change. This is extremely effective for monitoring machine operations in simple situations.

In addition, in the sampling lock process, the standard time compared with the actual measurement time is always constant, and the time B of each operation process must also be constant, so the machine operation when molding a molded product that requires precision It is effective for monitoring and can also be useful for quality control.

As described above, this invention stores each operation time in the previous molding cycle as a unit time and performs a monitoring process in which it is compared with the actual measurement time, or a range setting value is adjusted or subtracted from the memorized and fixed reference time. Since abnormalities in the machine during molding are detected using one of the sampling lock processes that is compared with the actual measured time, monitoring can be performed from the start of molding with a single operation, and the accuracy of molded products is improved. It has features such as being able to save electricity and reduce costs, and further improve safety in injection molding.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing the abnormality detection method according to the present invention. FIG. 1 is a block diagram during the monitoring process, and FIG. 2 is an explanatory diagram showing the difference between the monitoring process and the sampling lock process. 1...Counter, 2...Storage section, 3
... Comparison section, 4 ... Adder, 5.
...Subtractor, 6.7 ...Timer.

Claims (1)

[Claims] In an injection molding machine that sequentially controls each operation process required for injection molding, there is a process in which each operation process time is measured and stored for each molding cycle, and a process in which the memorized previous operation process time is used as a reference time. A monitoring process that detects an abnormality by comparing the actual measured time and a reference time within a predetermined range, and fixing the above reference time in the storage unit and adjusting the allowable up and down time from the reference time to create a standard time. A method for detecting the occurrence of an abnormality in an injection molding machine, which comprises a calculation process in which the actual time of each operation process is compared with the standard time to detect an abnormality.