JPS5818223A - Molding method - Google Patents

Abstract

PURPOSE:To mold a resin with insert parts without floating, displacing or deforming the insert parts and without leaving a pinhole, by loading the insert parts in a molding cavity, holding the insert parts by pins from outside, filling the uncured resin, and withdrawing the pins just before the completion of the filling to fill the spaces left by the withdrawing of the pins with the resin. CONSTITUTION:The insert parts 3 are previously loaded in the molding cavity 2 of the mold 1, and are held by the pins 4 that are inserted into the cavity 2 from outside. Then an uncured resin 5 is filled in the cavity 2, and immediately before the completion of the filling of the resin the pins 4 are retracted by a driving mechanism 8 so that the spaces left by the retraction of the pins 4 are filled with the resin. The driving mechanism 8 comprises a plate 11 and a core 10 having an inclination in contact with the plate 11, and by driving the core 10 laterally by a connecting rod 12 the pins 4 are retracted through springs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a molded product with an insert part.

Conventionally, as shown in FIG. 1, as a method for molding a molding convex mold with an insert part, an inner part 3 is loaded in advance into a molding hole 2 formed in a molding mold 1,
Furthermore, after this insert part 3 is pressed down with a pin 4 inserted from outside the cavity 2, uncured resin 5 is filled into the cavity 2 and cured as it is, and then the pin 4 is inserted from inside the cavity 2. There was a way to remove it.

However, as shown in Fig. 2, in the 6 molded products obtained by the above-mentioned conventional method, the marks of the pins 4 remain as holes 7, and these bottle holes 7 spoil the appearance of the product. In the case where the component 3 is made of metal, such as an electrical component for a key switch, there is a problem that the insert component 3 is easily corroded due to the bottle hole 7, and the electrical insulation properties are also deteriorated. Moreover, it was of course impossible to obtain a molded product without the bottle hole 7.

In order to avoid leaving such a bottle hole 7, the pin 4 described above must not be used, or the bottle hole 7 must be closed by another method after the molding is completed. In the former method, the insert part floats and becomes misaligned due to molding pressure, filling shock, etc. during molding.

This method cannot be used because deformation occurs and defective products are produced.

Also, in the latter method, the post-process becomes extremely troublesome, so
Due to the practical cost, it cannot be adopted.

This invention was made in view of the above background.
The purpose of this is that when molding a molded product with an insert part, the above-mentioned pin can be fixed without producing defective products due to the insert part floating out of position or being deformed, and without complicating the post-process. An object of the present invention is to provide a molding method #=t-: in which the remaining portion is also filled with resin so that no bottle holes are left.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that common or corresponding parts in each figure are indicated by the same reference numerals.

3WJ and FIG. 4 relate to the method F according to the invention.
An example of the device is shown. First, the device shown in the figure includes a mold IK, a pin 4 that is inserted movably from outside the molding cavity 2 and presses the insert part 3 loaded in advance into the cavity 2, and a pin 4 that is inserted into the mold cavity 2 from above. It has a pin drive mechanism 8 that is driven backward from inside the cavity 2. Furthermore, it has a timing detecting means for detecting the timing immediately before the filling of the resin 5 into the cavity 2 is completed, and the pin driving mechanism is operated based on the detection by the timing detecting means. It is.

Here, the pin driving device 8 includes a coil spring 9 that constantly urges the pin 4 in a direction to retreat from the cavity 2, a slide core 10 that is driven to move in a direction perpendicular to the pin 4, and this slide core. It has a backing plate 11 that slides on the pin 10 and moves in the direction in which the pin 4 advances and retreats. The slide core 10 is connected to a drive source such as hydraulic pressure via a connecting rod 12. Furthermore, the sliding surfaces of the core 10 and the plate 11 are inclined surfaces, and when the core 10 is driven rightward, the 1st pin 4 is pushed down and pushed into the cavity 2 as shown in FIG. Press down the inserted insert part 3. Further, when the core 10 is driven to the left, the pin 4 retreats upward due to the elastic restoring force of the spring 9 and separates from the insert part 3, as shown in FIG.

In the illustrated embodiment, the timing detecting means is constituted by a pressure sensor 13 that is filled into the cavity 2 and detects the pressure of the resin 5. This pressure sensor 13 receives the filling pressure in the cavity 2 via the penetrating rod 14 . and.

When this pressure sensor 13 detects the pressure immediately before the filling of the wrinkly fat is completed, the bin drive mechanism 8 is operated based on this detection, and the above-mentioned bottle drive mechanism 8 is operated immediately before the filling of the uncured resin 5 into the cavity 2 is completed. Retract pin 4. The magnitude of the detected pressure when operating the drive mechanism 8 is set in advance.

In addition, although illustration of the timing detection means is omitted,
It can also be configured by a timer.

In this case, the timer is configured to detect the time from the start of the filling operation of the resin 5 into the cavity 2, and when the timer detects the elapse of a preset time, Based on this, the pin driving device 8 is driven. This also allows the bottle 4 to be moved back just before the filling of the resin 5 into the cavity 2 is completed.

By using a molding device as described above.

First, as shown in FIG. 3, the insert part 3 is loaded into the molding cavity 2 in advance, and after the insert part 3 is pressed down with a pin 4 inserted from outside the cavity 2, the insert part 3 is launched into the cavity 2. Then, uncured resin 5 is filled through the gate. Then, as shown in FIG. 4, just before the filling of the resin 5 is completed, the bottle 4 is moved backward and separated from at least one insert part 5,
This allows the resin 5 to be filled even after the pin 4 has retreated. As a result, it is possible to obtain a molded product that does not leave at least a hole through which the insert part 3 can be seen in the trace of the pin 4. Of course, if necessary, the hole left by the pi/4 can be completely filled. What should be noted here is insert part 3
surfacing.

Misalignment, deformation, etc. are likely to occur at the beginning of filling the resin 5, and at least immediately before the filling is completed, floating 2
This means that no misalignment, deformation, etc. will occur. Therefore, in the molded product obtained, there are no remaining pin holes and there are almost no defects due to the floating of the insert part 3. This eliminates the possibility that the insert part 3 will be corroded, and in the case of products manufactured by Electrical Parts Group, products of good quality that do not suffer from corrosion or poor insulation can be obtained. Further, as in another embodiment shown in FIG. 5, when the insert part 3 is thin and is loaded floating in the middle part of the molding cavity 2, the insert part 3 may be deformed. It is possible to obtain a molded product that is correctly inserted in the specified position without having to do any additional work.

As described above, according to the present invention, a molded product with an insert part can be produced without leaving a bottle hole as in the conventional case, and the insert part can be lifted up and shifted by 9 positions.

It can be obtained relatively easily without producing defective products due to deformation and without performing any troublesome post-processes.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a conventional molding method, Fig. 2 is a plan view showing a molded product obtained by the conventional method, and Figs. 3 and 4 respectively show an apparatus using the molding method according to the present invention. FIG. 5 is a sectional view showing one embodiment, and FIG. 5 is a sectional view showing a main part of another embodiment. 1......Molding mold 2...Molding cavity 3...Insert parts 4...
... Bin 5 ...... Uncured resin 8 ...... Pin drive mechanism 9 ...... Wings 10 ...... Backing plate 13・・・・・
・Pressure sensor 14... Penetration rod patent applicant Tateishi Electric Co., Ltd.

Claims (1)

[Claims] (1) In a method for molding a molded product with an insert component, the insert component is loaded into the molding cavity in advance, the insert component tube is pressed down with a pin inserted from outside the cavity, and then the uncured material is placed inside the cavity. This is a patented molding method in which the resin is filled, and just before the resin filling is completed, the pin is moved back to separate from the insert part, and the crease bottle is moved back and the resin is filled into the remaining area.