JPH0237855B2 - SHASHUTSUSEIKEIKINOINSAATOBUTSUKENCHISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insert detection device in a mold of an injection molding machine, and in particular, an air conduction groove and an exhaust groove are formed in the mold, which communicate with an insert holding groove. This invention relates to an insert detection device that detects the presence or absence of an insert by passing compressed air through the groove.

Conventionally, in the mold of an injection molding machine for insert molded products, either visual inspection or inspection using a probe has been used to check whether the insert is correctly filled into the mold. Ta.

However, visual inspection is complicated because the operator has to visually check each time.Especially in the case of fine inserts, the visual inspection becomes a heavy burden and the accuracy of the inspection is affected. The disadvantage was that the value decreased significantly.

Furthermore, in the case of inspection using a probe, since the injection unit is located above the mold located at the injection work position, it is not possible to install a probe, and therefore the inspection is performed at the injection work position. Since it is not possible to do so, it is necessary to separately provide a dedicated inspection position, which has the drawback of increasing the size and complexity of the entire apparatus.

The purpose of the present invention is to provide an air conduction groove and an exhaust gas on the surface of the lower mold, which communicate with the insert holding groove, in view of problems such as a decrease in inspection accuracy and an increase in the size and complexity of the device in the insert inspection method based on the above-mentioned conventional technology. By forming a groove and having a structure in which both grooves are communicated through a mold engraving space, the above-mentioned drawbacks are eliminated, and easy and accurate detection is possible.This is an excellent insert detection method for an injection molding machine with a simple structure. The aim is to provide the equipment.

The structure of the present invention in accordance with the above object is such that an air conduction groove communicating with one of the insert holding grooves communicating with the die carving space of the mold and an exhaust groove communicating with another insert holding groove are connected to the lower mold surface. When the upper and lower molds are closed prior to the injection operation, compressed air is introduced into the air guide groove through the ventilation hole drilled in the upper mold. The compressed air flows through the insert holding groove and the molding space to the exhaust groove, and the insert is correctly filled into the insert holding groove based on whether or not it flows out into the atmosphere from there. The gist of this is that it is possible to detect whether or not the

Next, embodiments of the present invention will be described below based on the drawings.

An example of a molded insert 1 is shown in FIG. 1, and consists of a molded resin part 2 and an insert 3.

A mold for molding the insert molded product 1 is shown in FIGS. 2 and 3, and consists of an upper mold 4 and a lower mold 5 shown by dotted lines in FIG. As shown in FIG. 2, a plurality of die-cutting spaces 6 and a plurality of insert-holding grooves 7, 8 communicating with the die-cutting spaces 6 are formed in the lower die. Then, the lower mold 5
One of the insert holding grooves is provided on the upper surface of the
An air guide groove 9 is formed which communicates with the two holding grooves 7, and both ends 9a and 9b of the air guide groove 9 are closed. On the other hand, an exhaust groove 10 is formed which communicates with another of the insert holding grooves 8, and both ends 10a and 10b thereof are open to the side surface of the lower die 5 and communicate with the atmosphere. Note that 11 and 12 are resin passages for the sprue and runner, respectively.

As shown by the dotted line in FIG. 3, the upper mold 4 is provided with a ventilation hole 13, one end 13a of which is open on the side surface, and the other end 13b of which is connected to the air guide groove of the lower mold 5 on the lower surface.
It opens at a position aligned with the air guide groove 9 and communicates with the air guide groove 9.

As shown in FIG. 4, a flexible air supply pipe 14 is connected to one end 13a of the ventilation hole 13 of the upper mold 4, and the air supply pipe 14 is connected to an appropriate compressed air source (not shown). has been done. A pressure sensor 15 is inserted into the connecting portion of the air supply pipe 14, and the pressure sensor 15 is connected to a pressure detector 16 attached to the upper mold 4. Furthermore, 1
7 is an injection unit, and in the illustrated example, the upper mold 4 is directly attached to the injection unit 17, but the invention is not limited to this. Of course, the pressure sensor 16 may be of a structure in which the pressure sensor 16 is brought into contact with and released from the upper mold, and in this case, the pressure sensor 16 may be attached to the upper mold plate other than the upper mold.

In the above configuration, as shown in FIG.
Insert and fill inside. Thereafter, the upper and lower molds 4 and 5 are closed, and in this state compressed air is supplied to the air supply pipe 14.
This is introduced into the air guide groove 9 of the lower mold 5 through the ventilation hole 13 of the upper mold 4. At this time, since both ends 9a and 9b of the air guide groove 9 are closed, compressed air does not escape therefrom. Thus, if the insert 3 is correctly filled into the insert holding grooves 7 and 8, compressed air cannot pass through the holding grooves 7 and 8, and the ventilation holes 13
The pressure inside the air supply pipe 14 increases, and this can be detected by the pressure detector 16 via the pressure sensor 15.

On the other hand, if the insert 3 is not filled into the insert holding grooves 7 and 8 or is not inserted in the correct posture, the compressed air in the air guide groove 9 will flow from the insert holding groove 7 into the molding space. 6. It flows into the exhaust groove 10 through another insert holding groove 8, and flows out into the atmosphere from both ends 10a and 10b. At this time, the pressure inside the vent hole 13 and the air supply pipe 14 decreases, and this can be detected by the pressure detector 16.

In the above embodiment, the insert 3 of the insert molded product 1 has been described as having a structure that protrudes from the molded resin part 2 in two directions, but is not limited to this, and may protrude in three or more directions. In this case, the air conduction grooves and exhaust grooves formed in the lower mold may be in communication with any one of the three or more insert holding grooves. Furthermore, although the exhaust groove has been described as being open to the atmosphere at both ends, it may be open at only one end.

As described above, according to the present invention, in the lower die in which a plurality of insert holding grooves communicating with the die-scabbing space are formed, an air guide which communicates with one of the insert holding grooves and whose both ends are closed is provided. a groove, and an exhaust groove that communicates with another holding groove and has at least one end open to the atmosphere, and communicates both grooves with the insert holding groove through a die-carving space, and also includes a ventilation hole in the upper die. By having one end communicated with the compressed air source and the other end communicating with the air guide groove of the lower mold, it is possible to determine whether there is an insert or not when the upper and lower molds are closed. The position in the filled state can be accurately detected as pressure rise and fall on the air supply side.
Inspection can be performed at the injection work position, which has the advantage that the entire apparatus can be made more compact than when a separate inspection work position is added.

In addition, since compressed air, which is the detection medium, is introduced into the lower mold using the upper mold, the detection device can be attached to the upper mold side, such as the upper mold or the upper mold plate, and thus the work Compared to the lower mold, which moves and changes its working position depending on the process, the upper mold is fixed, so it has the advantage of being extremely easy to connect to detection equipment.

[Brief explanation of drawings]

The figure shows an embodiment of the invention.
The figure is a perspective view of the insert molded product, Figure 2 is a perspective view of the lower mold, Figure 3 is a perspective view of the upper mold of the closed upper and lower molds showing the upper mold with dotted lines, and Figure 4 is A of Figure 3. -A
FIG. 1... Insert molded product, 3... Insert product, 4... Upper die, 5... Lower die, 6... Die engraving space,
7, 8...Insert object holding groove, 9...Air conduction groove,
10...exhaust groove, 13...ventilation hole, 14...air supply pipe, 15...pressure sensor, 16...pressure detector.

Claims (1)

[Claims] 1. In an insert object detection device for an injection molding machine having upper and lower molds 4 and 5 formed with a plurality of insert holding grooves 7 and 8 communicating with a mold engraving space 6,
An air guide groove 9 communicating with one of the insert holding grooves 7 and closed at both ends is formed on the surface of the lower mold 5, and the other one of the insert holding grooves 8 is formed. An exhaust groove 10 is formed in the upper mold, and has at least one end opening to the atmosphere.
An insert for an injection molding machine, characterized in that one end 13a opens on the outer surface and communicates with a compressed air source, and the other end 13b has a ventilation hole 13 that opens into the air guide groove of the lower mold. Detection device.