JPH044118A - Molding condition monitoring device of press molding machine - 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 molding condition monitoring device for a press molding machine, and in particular, it monitors at least one of the mold opening amount and the injection body position in a filling process over a predetermined period of time. This invention relates to new improvements for monitoring the occurrence of defects by comparing them with acceptable values.

[Conventional technology]

There are various molding condition monitoring devices for this type of press molding machine that have been used in the past, but a typical one is one that is based on the method used by the applicant, although it is not shown in the figure. For example, the press speed of the press or the forward speed of the injection body of the injection device was controlled individually.

[Problem to be solved by the invention]

Since the conventional molding condition monitoring device for a press molding machine was configured as described above, the following problems existed.

In other words, since this was done by controlling only the press speed of the press machine or the forward speed of the injection body of the injection device, it was difficult to accurately detect the relationship between the amount of mold opening and the amount of molten resin injected in the filling process, and it was difficult to accurately detect the relationship between the amount of mold opening and the amount of molten resin injected in the filling process. Early detection, minimizing the amount of defective products, and automating molding operations were difficult.

The present invention has been made to solve the above-mentioned problems, and in particular, compares at least one of the mold opening amount and the injection body position in the filling process with an allowable value over a predetermined period of time, and identifies defects. It is an object of the present invention to provide a molding condition monitoring device for a press molding machine that monitors the occurrence of molding conditions.

[Means to solve the problem]

The molding condition monitoring device for a press molding machine according to the present invention injects molten resin into the mold cavity of a mold in an unclosed state via an injection device, and presses it with a press machine to obtain a molded product. In the press molding machine, the mold opening amount detection means for detecting the mold opening amount of the mold, the injection body position detection means for detecting the injection body position of the injection body of the injection device, and the injection body position detection means for detecting the injection body position of the injection body of the injection device; a tolerance value setting means for setting a tolerance value for at least one of a mold opening amount and an injection body position; and a comparison means connected to the tolerance value setting means and connected to the mold opening amount detection means and the injection body position detection means. , and timer output means connected to the comparison means.

[For production]

In the molding condition monitoring device for a press molding machine according to the present invention, at least one of the mold opening amount and the injection body position is compared with a set tolerance value based on a timer output signal from the timer means, and the tolerance value is determined. If it comes off, the molding conditions can be monitored by issuing a warning or stopping the machine based on the output signal from the comparison means.

〔Example〕

Hereinafter, preferred embodiments of a molding condition monitoring device for a press molding machine according to the present invention will be described in detail with reference to the drawings.

1 and 2 are for showing a molding condition monitoring device for a press molding machine according to the present invention, with FIG. 1 being a configuration diagram and FIG. 2 being a process characteristic diagram.

In the figure, the symbol 1 is a press machine,
A press hydraulic cylinder 4 is provided on a plurality of columns 3 provided on a base 2 of this press machine 1, and a piston rod 6 connected to a piston 5 of this press hydraulic cylinder 4 has an upper There are 7 molds.

A lower mold 8 provided on the base 2 is configured to fit with the upper mold 7, and a mold cavity 9 is formed between each of the molds 7.8.

A mold opening amount detection means 10 consisting of a position detector is provided on the side of the press hydraulic cylinder 4, and a rod 10 aci of this mold opening amount detection means 10 and a base of the upper mold 7 are provided. The upper mold 7a is connected to the upper mold 7a, and is configured such that the moving position of the upper mold 7a can be detected by a mold opening amount detection means 10.

An injection device zll is connected to and provided on the side of the lower mold 8, and an injection cylinder 1 of this injection device 11 is connected to the side of the lower mold 8.
The second injection port 12a communicates with a guide hole 8a formed in the lower mold 8.

An injection body 13 consisting of an injection runner or an injection screw provided in the injection cylinder 12 is configured to be able to freely reciprocate in the axial direction, and the rear end 1 of this injection body 13 is configured to be movable back and forth in the axial direction.
3a is a screw I provided in the injection hydraulic silicator 14.
- Connected to screws 1 to 16 of connector 15.

A rod 1 of a projectile position detection means 18 consisting of a position detector is connected to the rear end 13a of the projectile body 13 via a connecting portion]7.
8a is connected, and the injection body position detecting means 18 can detect the injection body position of the injection body 13, that is, the amount of molten resin injected.

The mold opening amount detection means 10 and the injection body position detection means 1
Mold opening amount detection value IOA of 8 and injection body position detection value 18
A is input to one comparison means consisting of a comparator,
One of the comparison means includes each detected value 1. OA, 18A
Tolerance value setting means 2o for setting a predetermined tolerance value 20a for is connected, as well as timer means 21 for outputting timer output signals TXI and TX2 at different times. Note that the allowable value 20a can be set to both an upper limit and a lower limit, or to either one of the upper limit and the lower limit.

The molding condition monitoring device for a press molding machine according to the present invention is configured as described above, and its operation will be described below.

First, the upper chamber 4 of the press hydraulic cylinder 4 of the press machine 1
When pressurized oil is supplied to a, the mold is closed and pressed, and when pressurized oil is supplied to the lower chamber 4b, the mold is opened.

When pressure oil is supplied into the first chamber 14a of the injection hydraulic cylinder 14 in the above-mentioned mold open state, the injection body 13 moves forward by the operation of the piston 15 and the piston rod 16, so that the molten resin B is poured into the lower mold. 8 into the mold cavity 9 through the guide hole 8a.

The above-mentioned mold opening amount detection value 10A and injection body position detection value 18A of the upper mold 7 are input to the comparison means 19, and
The elapsed time at this time is measured by the timer means 21.

Next, control during opening of the mold and advancement of the injection body will be explained using FIG.

As the upper mold 7 closes, the mold opening amount becomes 20.
When one point is reached, the press machine 1 starts pressing at high pressure, the injection device 11 starts injecting the molten resin B, and at the same time the timer means 21 starts timing.

Since the tolerance value setter 20 has a tolerance value 20a set for the injection body position 5IS2 and the mold opening amount PL, P2, in one comparison means, the timer means 21
Timer output signal TXI from.

At the time when TX2 is output, the tolerance value 20a is compared with the mold opening amount detection value 10A and the injection body position detection value 18A, and each of the detection values 10A and 18A are compared to the tolerance value 20A.
If it deviates from a, the comparison means 19 outputs a warning signal 19a.

This warning signal 19a allows the press molding operator to know of an abnormality in the molding conditions, such as a lamp, etc., and also allows the press molding operator to monitor the molding conditions, such as by stopping the machine.

In the above-described embodiment, both the mold opening amount and the injection body position are monitored, but similar effects can be obtained even if at least one of them is monitored.

Furthermore, although the case has been described in which both the mold opening amount and the injection body position are monitored simultaneously, similar effects can be obtained when they are monitored at different times.

Furthermore, the detection points of the mold opening amount and the position of the injection object are monitored using two timer output signals obtained from the timer means, but they are not limited to two points of time; for example, they can be monitored continuously during the process. In this case, similar effects can be obtained.

〔Effect of the invention〕

Since the molding condition monitoring device for a press molding machine according to the present invention is configured as described above, it is possible to obtain the following effects.

In other words, the amount of mold opening and the amount of molten resin injected (i.e., the position of the injection object), which are closely related to the quality of the molded product during the filling process, are detected by comparing them with tolerance values, making it extremely possible to determine the quality of the molded product. Can be detected accurately.

Therefore, early detection of the cause of defects, minimization of the amount of defective products due to this early detection, reduction of production costs, automation of molding operations, etc. can be achieved.

4. [Brief explanation on page 21] Figures 1 and 2 are for showing a molding condition monitoring device for a press molding machine according to the present invention. Figure 1 is a configuration diagram, and Figure 2 is a process characteristic diagram. It is.

1 is a press machine, B is a molten resin, 7 and 8 are molds, 10 is a mold opening amount detection means, 11 is an injection device, 18 is an injection body position detection means, 1 is a comparison means, and 20 is a tolerance value setting means, 2
1 is a timer means.

Patent applicant: Japan Steel Works Co., Ltd. Representative: Teru Sogado -1
-Ichiko Daien (21) is a timer means

Claims (1)

[Claims] The mold cavity (9) of the mold (7, 8) in an unclosed state
) in which the molten resin (B) is injected into the molds (7, 8) through the injection device (11) and pressed by the press machine (1) to obtain a molded product. a mold opening amount detection means (10) for detecting the mold opening amount; and an injection body position detection means (18) for detecting the injection body position of the injection body (11) of the injection device (11). , a tolerance setting means (2) for setting a tolerance for at least one of the mold opening amount and the injection body position;
0), the mold opening amount detection means (10) and the injection body position detection means (10) connected to the tolerance value setting means (20).
8), a comparison means (19) connected to the comparison means (19);
19), and based on a timer output signal from the timer means (21),
A molding condition monitoring device for a press molding machine, wherein the comparison means (19) compares at least one of the mold opening amount and the injection body position with the permissible value.