JPH0221347B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring injection filling pressure increase time when pouring metal into a mold in a die casting machine.

Generally, the pressure increase time in the injection process is measured for the purpose of controlling the casting conditions of die casting. Conventionally, this type of injection filling pressurization time measuring device measures injection pressure or casting pressure, and compares the measured injection pressure (casting pressure) with preset pressurization start injection pressure and pressurization end injection pressure. It is known that the structure is as follows.
That is, as shown in FIG. 1, the time t _SE from the time when the measured value of the injection pressure F exceeds the pressure increase start value Fs until it reaches the pressure increase end value F _E is measured.

However, according to the above-mentioned measuring means, it is required that the preset of the two slice levels consisting of the boost start value Fs and the boost end value _FE be appropriate. If the preset is incorrect, a situation may occur where measurements cannot be made. Furthermore, if an injection pressure F higher than the preset pressure increase start value Fs is measured before the actually measured interval, there is a problem that the pressure increase time from that point on will be measured.

Therefore, as a result of various studies to overcome the problems of the conventional injection filling pressure increase time measuring device described above, the present inventors have determined that the output signal of the pressure sensor that detects the injection pressure or casting pressure of the mold is The data is converted into the required digital signal, and this pressure data is stored in a memory circuit over time from the start of injection to the end of injection, and at the end of injection, the maximum pressure value is detected from the data stored in the memory circuit and this pressure data is Calculate the appropriate pressure increase time by calculating the pressure increase start pressure and pressure increase end pressure value from the detected value, and compare this calculation result with all pressure data in the memory circuit in the opposite direction to the storage order. It was found that the above-mentioned problems could be solved.

Therefore, an object of the present invention is to store all pressure data from the start of injection to the end of injection in a storage circuit,
By calculating the pressure increase start pressure and pressure increase end pressure based on the total pressure data stored at the end of injection and comparing the total pressure data, it is possible to achieve an appropriate pressure increase time measurement with a simple configuration. An object of the present invention is to provide an injection filling pressurization time measuring device for die casting.

In order to achieve the above object, the present invention includes a pressure sensor that detects the injection pressure or casting pressure of a mold, a pressure measurement circuit that converts the pressure signal of the pressure sensor into a digital signal as pressure data, and a pressure measurement circuit that converts the pressure signal of the pressure sensor into a digital signal as pressure data. A memory circuit that stores pressure data over time from the start of injection to the end of injection obtained by the circuit, and a maximum pressure value that is detected from all the pressure data stored in the memory circuit and a predetermined pressure increase from this maximum pressure value. An arithmetic circuit calculates the start pressure and the end pressure of boosting by calculation, and compares the result of this calculation with all the pressure data in the memory circuit in the opposite direction to the storage order to calculate the boost time. It is characterized by comprising a display circuit that displays the boost time.

In the above-mentioned injection filling pressurization time measuring device, it is preferable that the storage of the pressure data in the storage circuit is executed by controlling the storage circuit via the control circuit with external signals instructing the start and end of injection, respectively. It is.

Next, embodiments of the injection filling pressurization time measuring device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a block circuit diagram showing one embodiment of the measuring device of the present invention. That is, in FIG. 2, the measuring device of the present invention includes a pressure measuring circuit 10 that measures injection pressure (casting pressure), a memory circuit 12 that stores pressure data measured by this pressure measuring circuit 10, and a memory circuit 12. an arithmetic circuit 14 that calculates a maximum pressure value, an end value, and a boost start value from data stored in the memory circuit 12, and calculates a boost time; a display circuit 16 that displays the boost time calculated by the compute circuit 14; , a control circuit 18 that controls the arithmetic circuit 14 and the display circuit 16, respectively.
It consists of

Therefore, in the present invention, the injection filling and pressure increasing time is measured according to the following procedure using a measuring device having the above-described circuit configuration.

First, a pressure sensor (not shown) for detecting the injection pressure (casting pressure) of the injection filler is provided in the mold section of the die-casting machine. A pressure signal detected by this pressure sensor is supplied to a pressure measurement circuit 10 and converted into a digital signal. On the other hand, for the control circuit 18, the memory circuit 12, the arithmetic circuit 14
Appropriate external signals are supplied to generate control signals for controlling the display circuit 16 and the display circuit 16, respectively.

However, when the control circuit 18 determines the injection start state based on the external signal, the pressure measurement circuit 1
Control is performed to sequentially store pressure data measured over time from 0 in the storage circuit 12. Thereafter, when the control circuit 18 determines the completion state of injection based on an external signal, it outputs a command to the arithmetic circuit 14 to detect the maximum pressure value from the pressure data stored in the memory circuit 12. As a result, the arithmetic circuit 14
searches all the pressure data stored in the storage circuit 12 and detects the highest pressure value. For convenience of explanation, the total pressure data stored in the storage circuit 12 with changes in time t is shown in a graph as shown in FIG. 3.

Therefore, the calculation circuit 14 calculates the maximum pressure value from the total pressure data stored in the storage circuit 12.
When Fp is detected, the calculation circuit 14 calculates the pressure increase start pressure Fs and the pressure increase end pressure F _E based on the maximum pressure value Fp according to the following equations (see FIG. 3).

Pressure increase start pressure Fs = Maximum pressure value Fp × x% … (1) Pressure increase end pressure F _E = Maximum pressure value Fp × y% … (2) However, set appropriate values for x and y for measurement. . In this way, when the boost start pressure Fs and the boost end pressure F _E are calculated in the arithmetic circuit 14, the arithmetic circuit 14, under the action of the control circuit 18,
All pressure data sequentially stored in the storage circuit 12 over time is searched in the opposite direction to the data storage order, starting from the last stored data side. As a result, it is possible to measure the time from when pressure data corresponding to the previously calculated boost end pressure F _E is detected to when pressure data corresponding to the boost start pressure Fs is detected, that is, the boost time t _SE . . in this case,
In the memory circuit 12, by assigning a predetermined address to the memory for each unit time, it is possible to easily associate the pressure data stored in each address with time.

In this way, the boost time _tSE calculated by the arithmetic circuit 14 can be immediately displayed on the display circuit 16.

As is clear from the embodiments described above, the measuring device of the present invention stores the total pressure data of the injection pressure (casting pressure) in the injection process from the start of injection to the end of injection over time, and The maximum pressure value is detected from the total pressure data stored in the memory circuit, the pressure increase start pressure and the pressure increase end pressure are calculated based on this maximum pressure value, and then the memory order and the pressure increase end pressure are calculated for the total pressure data stored in the memory circuit. By searching in the opposite direction and comparing with the above calculation result, it is possible to achieve an appropriate measurement of the boost time _tSE . In particular, when comparing all pressure data in relation to pressure increase time, all pressure data stored in the memory circuit is searched in the opposite direction to the storage order. Even if there is a case (A) in which the pressure rise start pressure Fs is exceeded in (A), accurate measurement of the pressure rise time can always be achieved without causing erroneous measurements.

The measuring device of the present invention can be easily achieved by using a microcomputer, etc. equipped with a memory function, arithmetic function, and control function, and can prevent erroneous measurements due to presetting errors, etc., as in the conventional method. Therefore, it is possible to improve the performance and reliability of this type of measuring device.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the measurement procedure of a conventional injection filling boosting time measuring device, FIG. 2 is a block circuit diagram showing an embodiment of the injection filling boosting time measuring device according to the present invention, and FIG. 3 is a diagram showing the measuring procedure of a conventional injection filling boosting time measuring device. It is an explanatory diagram showing a measurement procedure of a measuring device. 10... Pressure measurement circuit, 12... Memory circuit, 14...
Arithmetic circuit, 16...Display circuit, 18...Control circuit.

Claims (1)

[Claims] 1. A pressure sensor that detects the injection pressure or casting pressure of a mold, a pressure measurement circuit that converts the pressure signal of the pressure sensor into a digital signal as pressure data, and an injection start obtained by the pressure measurement circuit. A memory circuit that stores pressure data from time to time until the end of injection over time, and a maximum pressure value is detected from all the pressure data stored in the memory circuit, and a predetermined boost start pressure and boost end pressure are determined from this maximum pressure value. an arithmetic circuit that calculates the boost time by calculating the pressure and compares the result of this calculation with all the pressure data in the memory circuit in the opposite direction to the storage order; and a display that displays the boost time calculated by the arithmetic circuit. An injection filling boosting time measuring device for die casting, characterized by comprising a circuit. 2. In the injection filling pressurization time measuring device according to claim 1, the storage of pressure data in the storage circuit is performed by controlling the storage circuit via a control circuit using external signals instructing the start and end of injection, respectively. This is an injection filling pressurization time measuring device for die casting.