JPH059144Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a synthetic resin injection mold.

(B) Prior Art In the case of molded products having undercut portions, various ideas have been made to determine how to remove them from the mold after molding. Japanese Patent Publication No. 58-84740
The mold described in the publication has undercut portions on the inside and outside of the molded product, and the undercut portions are molded by a pair of inside and outside slide cores. The slide core on the outside of the molded product has an angular pin attached to a fixed mold that passes through the inside of the slide core. When the mold opens, the angular pin separates from the slide core, and the slide core is pushed out by a pressing spring and moves in the mold opening direction. Slide in the right angle direction. In addition, the slide core inside the molded product was connected to the ejector plate via an angular rod, and by pressing the ejector plate when ejecting the molded product, it slid along the slope of the core part and separated from the undercut part. .

(c) Problems to be solved by the invention The purpose of the invention is to simplify the drive mechanism of the slide core that forms the undercut inside the molded product.

(d) Means for solving the problem In the present invention, a stripper plate for ejecting the molded product is provided in the movable mold. The stripper plate is connected to the ejector plate via rods. The slide core that forms the undercut inside the molded product has a slide path set so that it can be removed from the undercut by moving relative to the movable mold in the mold opening direction. The stripper plates are connected to the stripper plate at variable intervals.

(E) Function When ejecting a molded product, when the ejector plate is pushed, the stripper plate also moves via the rod. Since the stripper plate and the slide core are connected by a power transmission pin, the slide core slides along the slope of the core portion and separates from the undercut portion while pushing out the molded product.

(F) Example In FIG. 1, 1 is a fixed mold, 2 is a movable mold, and 3 is a part between the fixed mold 1, the movable mold 2, the stripper plate 5, and a pair of slide cores 4. It is a molded product that is molded. stripper plate 5
is connected to an ejector plate 11 disposed inside the movable mold 2 via a rod 12, and engages the peripheral edge of the molded product 3 with an annular recess 15 carved in the front surface. The slide core 4 is attached to the outer surface of the core portion 7 and forms a protruding undercut portion 6 inside the molded product 3. The slide path of the slide core 4 is set along the slope of the outer surface of the core part 7, and due to relative movement in the mold opening direction between the movable mold 2 and the slide core 4, the pair of slide cores 4 The distance between them narrows or widens. A through hole 9 is provided in the stripper plate 5 and the slide core 4 in a direction perpendicular to the mold opening direction.
The power transmission pin 8 is inserted through the stripper plate 5 toward the slide core 4. Power transmission pin 8
The base of is fixed to the stripper plate 5,
The tip portion is slidable on the slide core 4.
Further, a pin 10 that engages with the back surface of the stripper plate 5 is implanted in the slide core 4. Ejector plate 11 includes rod 12 and ejector pin 13.
is installed.

Next, the operation will be explained based on FIGS. 2 and 3. After molding with the above mold, when the mold is opened, the dowel pin 14 hits the ejector plate 11 and the ejector pin 1 hits the ejector plate 11, as shown in the figure.
3. The molded product 3 is ejected by the stripper plate 5 and the slide core 4. At the same time as the ejection, the stripper plate 5 begins to separate from the movable mold 2, and the slide core 4 is pushed out by the power transmission rod 8, slides along the slope of the core portion 7, and separates from the undercut portion 6 inside the molded product. (Figure 3). This allows the molded product 3 to be removed. When closing the mold, in addition to being pulled in by the power transmission pin 8, the stripper plate 5 is pulled in by the pin 1.
Press 0 to fit the slide core 4 into its original position.

(g) Effects of the invention According to the invention, the slide core and stripper plate are connected by a power transmission pin so that the movement of the ejector plate is transmitted to the slide core via the stripper plate. There is no need to take any precautions such as connecting the slide core and ejector plate by an inclined rod and a slider, or by an inclined rod and a link, and the driving mechanism of the slide core can be simplified.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view when the mold is closed, and FIGS. 2 and 3 are sectional views showing a series of operations when the mold is opened. DESCRIPTION OF SYMBOLS 1... Fixed mold, 2... Moving mold, 3... Molded product, 4... Slide core, 5... Stripper plate, 6... Undercut part, 8... Power transmission pin, 11... ...Ejiecta plate.

Claims (1)

[Scope of claim for utility model registration] A fixed mold, a movable mold, a stripper plate connected to an ejector plate provided on the movable mold, and an undercut portion inside the molded product also provided on the movable mold. The slide core is configured to set its slide path away from the undercut portion by moving relative to the movable mold in the mold opening direction, and the slide core and the stripper plate are set to move away from the undercut portion. An injection mold in which the two are connected at variable intervals by a power transmission pin.