JPH02107422A - Injection molding machine - Google Patents

Abstract

PURPOSE:To engage a mold with a container and to detachably mount it in a cassette type by providing a mold containing base at both opening and closing ends of a mold opening/closing mechanism, and combining both containing bases in a state that the mechanism is closed to form the mold container. CONSTITUTION:A mold opening/closing mechanism incorporates a core side containing base 21 and a cavity side containing base 31 at a core side opening/ closing end 2 and a cavity side opening/closing end 3 respectively, and is opened or closed by a driving mechanism 4. A mold container 5 is composed of the bases 21, 31 to become a space in which a core mold 6 and a cavity mold 7 are contained as engaged as a pair from above. A slide block 22 for detachably mount an undercut core 61 is provided at the base 21, and the core 61 is telescoped by the guide of an angular pin 32 and a guide block 33 detachably inserted into an angular hole 23.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention molds a molded product by injecting a molten material into a gap formed by fitting a pair of molds each consisting of a core and a cavity. It relates to injection molding machines.

(B) Conventional technology Conventional injection molding machines have a heating melting section that melts materials such as synthetic resin, a screw conveyance section that conveys the material to the injection nozzle while maintaining the molten state, and an injection section that injects the material into the mold. The opening/closing ends of the mold opening/closing mechanism are formed on a fixed plate and a movable plate, respectively, and a core mold and a cavity mold each having a molded product shape engraved thereon are attached and rubbed together. It was designed to work properly. However, with this type, the attachment mechanism for attaching the mold to the fixed platen and the movable platen, respectively, and the engraved part of the molded product shape are integrated, so the same number of attachment mechanisms to the molding machine are required for each type of molded product. Therefore, one outer frame can be used for multiple molded product shapes by using the outer frame as the mounting mechanism for the molding machine and attaching the medium die for engraving the molded product shape replaceably inside the outer frame. Molds are now available.

(c) Problems to be solved by the invention In conventional injection molding machines, emphasis was placed only on the material injection mechanism and the mold opening/closing mechanism, and no special consideration was given to the mold attachment. There was a problem in that excessive time and labor were required to replace the molds, which made it completely unprofitable for small-scale molding operations. This problem has not been completely solved even in molds in which the middle mold is replaceable, as it still requires work to attach and detach the outer frame to the fixed plate and movable plate, which are the ends of the mold opening/closing mechanism.

(d) Means for solving the problems As a means for solving the above problems, the present invention provides a mold housing base corresponding to the mold outer frame at both opening and closing ends of the mold opening/closing mechanism, and By combining the reaccommodating bases to form the mold accommodating part when the mechanism is closed, it is possible to insert the mold into the accommodating part while the mold is still fitted, and to attach and remove it in a cassette style. did.

In addition, by providing accommodation bases at both opening and closing ends, various equipment conventionally installed on the mold side can be installed on the accommodation base, which helps reduce the size of the mold and secures space for engraving the shape of the molded product. be.

(e) Operation When the mold opening/closing mechanism is closed, the housing bases provided at both opening and closing ends are combined to form a mold housing part, into which the mold with the core cavity fitted as a pair is inserted. be done. It goes without saying that the closed state of the opening/closing mechanism when the mold is inserted is not a complete mold-clamped state, but a closed state that takes into account the necessary fitting space and other allowances.

When the mold is inserted, a retractable pressing piece provided on one side of the housing base on one side (core side) presses the mold and presses the mold against one corner of the housing, thereby changing the position of the mold within the housing. is fixed, the injection nozzle of the molding machine and the material introduction path of the mold are aligned, and the core mold is clamped. The cavity mold is provided on the other (cavity side) accommodating base and is clamped by an appropriate clamping mechanism.

If undercut molding is required, after the mold is installed, the opening/closing mechanism is opened once, and then the undercut core is installed on the slide mechanism provided on the core side accommodation base.

Once the mold is installed in this manner, the opening/closing mechanism is then clamped to the end of the stroke to completely close and fit the mold, and the material is injected and molded. When the injection molding is completed, the mold is cooled, the mold is opened, the molded product is peeled off from the mold using an eject bin provided on the core side, the mold is closed again, and the injection molding process is repeated.

(f) Implementation example Hereinafter, the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a mold opening/closing mechanism, which is provided with a core side accommodation base 21 and a cavity side accommodation base 31 at a core side opening/closing end 2 and a cavity side opening/closing end 3, respectively, and is opened and closed by a drive mechanism 4.

Reference numeral 5 denotes a mold accommodating portion, which is constituted by the fitting of the accommodating bases 21 and 31, and serves as a space into which the core mold 6 and the cavity mold 7 are fitted as a pair from above.

The core-side accommodation base 21 is provided with a slide block 22 on which the undercut core 61 is removably attached, and the undercut core 61 is moved in and out by the guide of the angular pin 32 inserted into and removed from the angular hole 23 and the guide block 33. It has become. Of course, this operating mechanism may have other configurations.

Also provided as a clamp mechanism is a presser 24, 24 which positions and fixes the die 6 at once by contacting the mold 6 with its inclined end face and pressing it from an angular direction to one corner of the fitting space. Of course, this fixing method can also be obtained by other methods.

The angular pin 3 is mounted on the cavity side accommodation base 31.
2. In addition to the guide block 33, a material introduction path 34 is provided, and the material injected from the injection part 8 is transferred to the introduction path 71 of the mold 7.
will be relayed to. This introduction path is smoothly connected by positioning the pusher 24. Furthermore, since the mechanism 35 for clamping the mold 7 is already positioned by the presser 24, an appropriate mechanism may be used.

9 is a screw conveyance section, and 10 is a material heating and melting section.

(G) Effects of the Invention Since the present invention is constructed as described above, it is possible to greatly reduce the attached parts conventionally provided in a mold, thereby obtaining an efficient shape engraving space, and also making it possible to improve the shape of the mold. It does not require any molding machine attachment members such as an outer frame, and allows the mold to be attached and detached directly, simply and quickly, and is extremely advantageous in terms of both equipment costs and labor.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is an overall side view with a part cut away, Fig. 2 is a sectional view showing the relationship between the mold storage base and the mold, and Fig. 3 is a cross-sectional view showing the relationship between the mold storage base and the mold. FIG. 4 is a perspective view showing the relationship between the undercut core and the slide block, and FIG. 4 is a plan view from the side where the mold accommodating part falls in, showing the relationship between the mold and the clamp mechanism. 1 - Mold opening/closing mechanism 2 - Core side opening/closing end 21 - Core side accommodation base 22 - Slide block 23
~ Angular hole 24 ~ Presser 3 ~ Cavity side opening/closing end 31 ~ Cavity side accommodation base 32 ~ Angular pin 33 ~ Guide block 34 ~ Material introduction path 3
5 - Clamp 4 - Opening/closing drive mechanism 5 - Mold accommodating section 6 - Core mold 61 - Undercut core 62 - Eject pin 63 - Guide pin 7 - Cavity mold 7
1-Material introduction path 8-Material injection section 9-Screw conveyance section 10-Heat melting section 1) % formula % 1. Indication of the case Patent Application No. 260450 filed in 1988 2. Name of the invention Injection molding machine 3. Person making the amendment Relationship to the case Patent applicant address 1500 Miyatani, Tomihama-cho, Otsuki City, Yamanashi Prefecture Address Sankyo Engineering Co., Ltd. Name Representative Director Meng Nakamura 4, Agent 8103 Address 4-1)-65, Nihonbashi Honmachi, Chuo-ku, Tokyo Drafted mortar subject to amendment Shipped on January 6, 1989 1999 January 31st map

Claims (2)

[Claims] (1) At both opening and closing ends of the opening/closing mechanism that connects to the mold and opens and closes the mold, a pair of accommodation bases forming a mold accommodating part into which the fitted mold is inserted is provided, and the opening/closing mechanism is closed. An injection molding machine characterized in that a clamping mechanism for clamping a mold inserted in a state is disposed on a housing base. (2) An injection molding machine according to claim (1), which is provided with a slide mechanism that includes a mounting section for removably mounting the undercut core on the accommodation base.