JPH0414049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to streamline the manufacturing of injection molding molds, and in particular, in the current mold manufacturing where each molded product is made to order, the base part of the mold is attached to the molding machine. In this state, only the mold part (core or core and cavity) can be easily attached and detached, thereby simplifying mold production, shortening production days, reducing costs, and improving the molding machine. The aim is to streamline and simplify mold replacement.

That is, to explain the configuration of the present invention, a stripper plate 2 and a movable side template 3 are installed relative to a fixed side template 1, an arbitrary cavity 4 is provided on the fixed side template 1, and a stripper plate 2 is installed relative to the fixed side template 1. The core body 5a straddles the par plate 2 and the movable template 3.
In an injection mold having an existing configuration in which an arbitrary core 5 consisting of a core product portion 5b and a core product portion 5b are appropriately fitted, a fan-shaped protruding portion 6 is provided at the lower end of a cylindrical core body 5a.
(In the illustrated example, two symmetrically arranged protrusions), and on the other hand,
A core fitting hole 7 into which the core body 5a is tightly fitted is formed in the movable template 1, and a fan-shaped protrusion 6 is formed on the inner wall of the core fitting hole 7 (front and rear inner walls in the illustrated example). A groove 8 is cut through which the core body 5a is inserted, and an engaging recess 9 is cut at the lower end of the core fitting hole 7 so as to communicate with the hole 7 and the groove 8. After passing the fan-shaped protrusion 6 through the groove 8 in the core fitting hole 7, the stripper 10 is rotated by a set angle (for example, 90°) within the engagement recess 9 and the stripper 10 collides and stops, and the fan-shaped protrusion 6 is engaged. Recess 9
By being engaged and locked, the core 5 is attached to the movable mold plate 3, and conversely, the core body 5a is rotated in the opposite direction to the above, and the engagement lock between the engagement recess 9 and the fan-shaped protrusion 6 is released. , by passing the protrusion 6 through the groove 8 and removing the core body 5a from the core fitting hole 7, the core 5 is removed from the movable template 3, and the core 5 is removed from the movable template 3. 3, it is configured to be detachable and replaceable.

In the above, ()...the core body 5a is a portion of the core 5 that is fixedly fitted into the movable side template 3 and is located astride the movable side template 3 and the stripper plate 2. The core product part 5a is a so-called core part, and corresponds to a core (male part) opposite to a cavity (female part).

()...The core body 5a is fitted into the core fitting hole 7 of the movable side template 3, and its fan-shaped protrusion 6 is engaged and locked in the engagement recess 9, so that it is fitted and installed in an immovable state. Therefore, its external shape must be cylindrical (circular in cross section), but the planar shape of the core product part 5b can be arbitrary, such as circular, square, or rectangular. In addition to molding products, it is also possible to form molds for rectangular or rectangular molded products such as square boxes and box lids, and other shapes of arbitrary shapes that can be formed into the core product portion 5b. Further, it is also possible to drill a small hole 11 for a temperature control circuit on the central axis of the core 5, or to drill an ejector pin insertion hole.

()...The head is locked on the upper surface of the stripper plate 2 (parting line), the lower end is protruded into the cavity of the receiving plate 13 through the plate 2 and the movable mold plate 3, and the stopper is attached to the protruding end. By installing the stripper restriction pin 15 to which the stripper plate 14 is attached, the stripper plate 2 is opened from the movable template 3 by the guide of the stripper restriction pin 15 until it collides with the stripper 14 and stops. Therefore, the core body 5a can be easily and quickly replaced in the expanded space between the stripper plate 2 and the movable mold plate 3 while the base part of the mold remains attached to the molding machine. sell.

()...When the core 5 is inserted into and removed from the core fitting hole 7 of the movable side template 3 as described above, it is ensured that the core body 5a is rotated at the set angle (for example, 90°). Therefore, due to repeated replacement, when a sealer or packing such as the O-ring 16 is installed on the lower surface of the core body 5a, the O-ring 16 etc. may be damaged by friction with the surface to be fitted (the upper surface of the receiving plate 13). There is a risk of damage.

Therefore, in the present invention, a bolt 17 for fixing the movable template 3 is installed which penetrates the movable template 3 and is screwed onto the upper surface of the receiving plate 13, and the lower surface of the movable template 3 close to the bolt 17 is connected to the receiving plate 13. An elastic body 18 such as a coil spring, a disc spring, or urethane resin is interposed between the relative positions on the upper surface of the plate 13, and when the bolt 17 is loosened, the elastic force of the elastic body 18 causes the movable mold plate to move. 3 is floated to form a gap between it and the receiving plate 13, thereby,
The lower surface of the core body 5a fitted into the core fitting hole 7 with a slight separation between the movable mold plate 3 and the receiving plate 13 engages the fan-shaped protrusion 6 without strong friction with the upper surface of the receiving plate 13. By engaging and locking into the mating recess 9 and then tightening the bolt 17, the core 5 can be attached and detached without damaging the O-ring 16 or the like.

Therefore, in addition to the original function of fixing the movable side mold plate 3 to the receiving plate 13, the bolt 17 performs the above-mentioned function, and also utilizes the above-mentioned gap-forming function to fit the core. Another advantage is that holes and other parts can be cleaned.

()...Also, according to the present invention, the core 5 can be easily attached and detached by opening the stripper plate 2 while the base portion of the mold remains attached to the molding machine as described above. The cavity part and stripper part, which together with the core are the main parts of mold part formation, may have a common shape, but in particular, the cavity part always changes for each molded product (that is, each time the core is changed). Therefore, it is desirable that these parts are also removable and replaceable.

Therefore, for example, the cavity part and the stripper part for the part of the core 5 exposed on the movable template 3 (the upper part of the core body 5a and the core product part 5b) are replaced with a cavity bush 4a and a stripper part having a nested structure. It is formed as a thread 2a and is removably fitted into installation parts 4b and 2b cut into the fixed side template 1 and the stripper plate 2, respectively, using fastening bolts 19, etc., and the core 5 and the stripper plate By making the ripper bushing 2a and the cavity bushing 4a as a trio, which can be attached and detached at the same time, it is possible to remove the entire mold from the molding machine when changing the molded product. However, in the present invention, the purpose of replacing the mold can be achieved very easily and quickly by simply attaching and detaching the trio, while the base portion of the mold remains attached to the molding machine.

As described above, the present invention has the excellent feature that the base part of the mold remains attached to the molding machine, and the core can be installed, removed, and replaced extremely easily and accurately. Since the stripper bushing and stripper bushing are detachable and replaceable as a trio, replacing and installing just the mold part can be done more easily and quickly, simplifying mold replacement work for the molding machine and greatly reducing the number of production days. It has major features such as cost reduction.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view of an injection mold according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view showing an example of the configuration of the core, stripper bush, and cavity bush of the present invention, and an example of their installation state. 3A is an enlarged sectional view taken along the line A-A' in FIG. 2, and FIG. 3 is an enlarged sectional view taken along the line B-B' in FIG. Code, 1... Fixed side template, 2... Stripper plate, 2a... Stripper bush, 2b
... Installation part, 3 ... Movable side template, 4 ... Cavity, 4a ... Cavity bush, 5 ... Core,
5a...Core body, 5b...Core product department, 6...
Fan-shaped protrusion, 7... Core fitting hole, 8... Groove, 9...
...Engaging recess, 10... Its stopper, 11...
Small hole for temperature control circuit, 13... Receiving plate, 14... Stopper, 15... Stripper limit pin, 16...
...O-ring, 17... Bolt, 18... Elastic body, 19... Fastening bolt.

Claims (1)

[Claims] 1. A stripper plate and a movable template are installed relative to the stationary template, an arbitrary cavity is provided in the stationary template, and a stripper plate and a movable template are also installed on the stripper plate and the movable template. Therefore, in an injection mold in which an arbitrary core consisting of a core body and a core product part is appropriately fitted, a fan-shaped protrusion is provided at the lower end of the cylindrical core body, while the movable side A core fitting hole is bored in the template, a groove is cut perpendicularly to the inner wall of the core fitting hole, and an engaging recess is cut in the lower end so as to communicate with the core fitting hole and the groove, The core body is inserted into the core fitting hole of the movable side template, its fan-shaped protrusion is passed through the groove, and then rotated at a set angle within the engagement recess to lock the core to the movable side template. The cavity portion and the stripper portion relative to the upper part of the core body and the core product portion are formed as a cavity bush and a stripper bush having a nested configuration, and the cavity bush and the stripper bush are removably provided. A core-exchangeable injection mold, wherein bushings are removably fitted into mounting portions cut into the fixed side mold plate and the stripper plate by means of fastening means. 2. In the core-replaceable injection mold according to claim 1, a movable template fixing bolt is installed which penetrates the movable template and is screwed onto the upper surface of the receiving plate, and a movable template fixing bolt is installed near the bolt. An elastic body is interposed between the lower surface of the movable mold plate and the upper surface of the receiving plate, and when the bolt is loosened, the movable mold plate is lifted by the elastic force of the elastic body, thereby creating a gap between the movable mold plate and the receiving plate. A core-exchangeable injection mold designed to form a core.