JPS6347452Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to the structure of a mold for a cylindrical frame formed by molding plastic so that an insert part penetrating the peripheral wall is inserted.

(b) Background of the Technology FIG. 1 is a perspective view of a cylindrical frame constituting the casing of a small electromagnetic relay, and the frame 1 consists of a molded body 2 and a pair of terminal fittings 3 to 5, respectively. That is, a molded body 2 formed by injection molding of plastic has a pair of terminal fittings 3 for movable contact springs, and a pair of terminal fittings 3 for each movable contact spring.
A pair of terminal fittings 4 and 5 for fixed contacts are fixed so as to pass vertically through the side mold of the molded body 2 by insert molding means.

When creating such a frame 1, the terminal fittings 3 to 5 inserted into the same side die of the mold body 2 are connected by a connecting member, and this is inserted into a predetermined part of the mold for forming the mold body 2. For example, the mold structure is not only simpler than when each terminal 3 to 5 is inserted individually, but also the product precision and productivity are significantly improved.

FIG. 2 is a perspective view for explaining the method of making the frame 1 shown in FIG. A plurality of insert groups 7 having both ends extended are connected to a pair of connecting members 8 and 9. After the pair of strips 6 are fixed to the mold, the mold body 2 is formed by injecting plastic into the cavity of the mold.

(c) Prior Art and Problems Fig. 3 is a side sectional view showing the main structure of the conventional mold and the state of the plastic mold, and Fig. 4 shows the mold shown in Fig. 3 in the open state. FIG.

In FIGS. 3 and 4, the mold die 11
is a movable mold 12 fixed to a movable mold plate (not shown)
It is composed of a plurality of side molds 13 that can slide along the upper surface of a movable mold 12, a fixed mold 14 fixed to a fixed mold plate (not shown), and a plurality of angular pins 15.

In Fig. 3, the mold 1 is closed.
1, a movable mold 12, a side mold 13, and a pin-shaped fixed mold 14 form a mold cavity, and the upper part of a pair of strips 6 is sandwiched between the side mold 13 and the fixed mold 14. Therefore, by injecting molten plastic into the cavity, the molded body 2 in which the intermediate portion of the strip 6 is inserted is formed. However, in order to sandwich the thick strip 6, one of the side mold 13 and the fixed mold 14 is provided with a groove (not shown) into which the corresponding part of the strip 6 is inserted.

In FIG. 4, the molding die 11 is opened by moving the movable die 12 downward. That is, the fixed mold 14 is separated from the frame body 2 due to the downward movement, and since each side mold 13 is provided with a diagonal hole 16 that fits into a pin 15 that opens downward at a certain angle, the side mold 14 is separated from the frame 2. 13 is a movable mold 12 that opens outward.
Slide on the top surface. As a result, the molded body 2 in which the intermediate portion of the strip 6 is inserted into the surrounding wall can be taken out of the molding die 11.

However, when the mold 11 having such a structure is closed, the movable die 12, side die 13, and fixed die 14 come close to each other at the same time to form the mold cavity, so it is impossible to confirm whether the predetermined portion of the strip 6 is completely inserted into the insertion groove of the side die 13 or the fixed die 14. Even if it looks like the strip 6 is inserted when viewed from the outside of the mold 11, it may not be inserted inside the mold. As a result, not only is the product inferior, but the mold 11 is also damaged.

(d) Purpose of the invention The purpose of the invention is to provide a mold in which the above-mentioned drawbacks are eliminated.

(e) Structure of the device The above purpose is to provide a movable mold fixed to a movable mold plate, a plurality of side molds that can slide on the upper surface of the movable mold, a fixed mold fixed to a fixed mold plate, and the side molds. A molding die having a cylindrical frame body, comprising a driving body for sliding, and the sliding of the side mold is performed by separating the movable mold and the fixed mold. .

(f) Example of the invention Figures 5 to 7 related to an example of the invention are shown below.
The present invention will be explained using figures.

FIG. 5 is a side sectional view showing the main structure of the mold for molding the frame 1 shown in FIG. 1 and the state of the plastic mold, and FIGS. 6 and 7 illustrate the opening operation of the mold. FIG.

In FIG. 5, the mold 21 includes a movable mold 23 fixed to a movable mold plate 22, a plurality of side molds 24 that can slide along the upper surface of the movable mold 23, and fixed to a fixed mold plate (not shown). fixed mold 25, a plurality of driving bodies (air cylinders) 26 that slide each side mold 24, each side mold 24 and a counter driving body 26.
It is composed of a drive shaft 27 etc. that connects the drive shaft 27 and the like. The closed mold 21 is moved to a movable mold 23.
The side mold 24 and the fixed mold 25 form a mold cavity, and the upper parts of the pair of strips 6 are inserted into grooves (not shown) formed on the inner surface of the side mold 24 to form the fixed mold 2.
On the other hand, the lower part of the strip 6 is inserted into a groove (not shown) formed on the inner surface of the side mold 24 and is restrained by the central protrusion 28 of the movable mold 23. Therefore, by injecting molten plastic into the cavity, a molded body 2 into which the intermediate portion of the strip 6 is inserted is formed.

In FIGS. 5 and 6, the mold die 21
In the first step of opening the mold, the movable mold plate 22 is moved downward. As a result, the movable mold 23 fixed to the movable mold plate 22 and the side mold 24 mounted on the movable mold 23
Then, the drive shaft 27 supported by the bearing part 29 of the movable mold plate 22 and the drive body 26 connected to the outer end of the shaft 27 descend together, and the fixed mold 25 moves down to the mold body 2.
removed from.

In FIG. 5 and FIG. 7, the mold die 21
In the second step of opening the mold, each driving body 26 is operated to slide it toward the side mold 24. As a result, the side mold 24 separates from the mold body 2, and the mold body 2 remains on the central protrusion 28 of the movable mold 23 and can be taken out of the mold 21 or run in a direction perpendicular to the plane of the paper. .

Next, in order to form a new mold body, the mold 21 is closed by allowing the pair of strips 6 to sandwich the movable mold protrusion 28 at their lower portions, and then the mold 21 is closed in the opposite manner to the above-described mold opening operation. It is executed by operating . Therefore, when the lower side end surface of the side mold 24 is made to sandwich the movable mold protrusion 28 as shown in FIG. can be confirmed visually.

In FIG. 5, a flange 30 is provided at the intermediate portion of the drive shaft 27 near the drive body (air cylinder) 26.
On the other hand, a rubber O
The ring 32 is inserted, and the O-ring 32 is compressed by a predetermined amount in the mold-closed state. This is when the mold die 21 is closed.
When the movable mold 23 is moved upward while the pressing force of the driver 26 is applied to the side mold 24 in the mold state shown in FIG. This is based on special consideration to avoid bending. That is, movable type 2
When the pressing force of the drive body 26 is released prior to the upward movement of No. 3, the elastic restoring force accumulated in the O-ring 32 pushes the drive shaft 27 and the side mold 24 back a small amount to the outside of the mold, and the pair The opposing distance between the strips 6 becomes wider by that amount, or becomes easier to widen.
This makes it possible to prevent the strip material 6 from being bent.

(g) Effects of the invention As explained above, according to the invention, it is possible to visually check whether the specified part of the insert part is inserted into the specified groove of the mold, thereby eliminating the insertion defects that conventionally occur. This has the practical effect of eliminating defective products and damage to molds.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a frame constituting the casing of a small electromagnetic relay, Fig. 2 is a perspective view for explaining the method of making the frame, and Fig. 3 is a conventional structure for making the frame. FIG. 4 is a side sectional view showing the main structure of the mold and the state of the plastic mold; FIG. 4 is a side sectional view showing the mold shown in FIG. 3 in an open state; FIG. 5 is an embodiment of the present invention. FIGS. 6 and 7 are side sectional views for explaining the opening operation of the mold shown in FIG. 5. FIGS. In the figure, 1 is a cylindrical frame, 2 is a frame 1
A mold body, 3 to 5 are terminal metal fittings whose intermediate parts are inserted into the frame 1, 6 is an insert strip material in which the terminal metal fittings 3 to 5 are connected, 11 and 21 are mold dies,
12, 23 are movable types, 13, 24 are side types, 14,
25 is a fixed type, 22 is a movable mold plate, 26 is a driving body (air cylinder), 27 is a drive shaft, 29 is a bearing portion of the movable mold plate 22, 30 is an intermediate flange of the drive shaft 27, and 31 is a bearing portion of the bearing portion 29. The counterbore 32 indicates an O-ring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a molding die of a plastic cylindrical frame in which an insert part penetrating the surrounding wall is inserted, a movable die fixed to a movable die plate and the upper surface of the movable die are slid. The method includes a plurality of movable side molds, a fixed mold fixed to a fixed mold plate, and a driving body for sliding the side molds, and the sliding of the side molds causes the movable mold and the fixed mold to separate. A molding die for a cylindrical frame body, characterized in that it is configured to perform the following steps. (2) The drive shaft that connects the drive body and the side mold is provided with an elastic body having elasticity in the thrust direction between the drive shaft and the bearing of the movable mold plate that supports the drive shaft, and the pressing force of the drive body is reduced. The mold for a cylindrical frame according to claim 1 of the above-mentioned utility model registration claim, characterized in that the side mold is movable outward by the elastic restoring force of the elastic body when released. .