JP-2026074714-A - Manufacturing method for molded products

JP2026074714AJP 2026074714 AJP2026074714 AJP 2026074714AJP-2026074714-A

Abstract

[Problem] To provide a technology that allows the use of a molded product having a gate on the leading edge in the punching direction when forming an integral molded product using a first molded product, a second molded product, and a third molded product. [Solution] The movable mold 04 is moved so that the first intermediate integral molded product 32 held in the fixed mold 03 and the third molded product 19 held in the movable mold 04 face each other, and the first intermediate integral molded product 32 and the third molded product 19 are joined together with molten resin 20 to form an integral molded product. [Selection Diagram] Figure 7

Inventors

佐藤遼
山本大貴
山口裕久雄
吉川晋平
來山泰明

Assignees

キヤノン株式会社

Dates

Publication Date: 20260507
Application Date: 20241021

Claims (14)

A manufacturing method for producing an integrally molded product including a first molded product, a second molded product, and a third molded product using a fixed mold and a movable mold, A first molding step involves closing the molds with the first molded product held in the fixed mold and the second molded product held in the movable mold facing each other, and then joining them by pouring molten resin into the space formed by the first molded product and the second molded product to form a first intermediate integral molded product. A method for manufacturing a molded product, comprising: a second molding step of closing the mold with the first intermediate integral molded product held in the fixed mold and the third molded product held in the movable mold facing each other, and joining them by pouring molten resin into the space formed by the first intermediate integral molded product and the third molded product.
A method for manufacturing a molded article according to claim 1, comprising a molding step of closing the fixed mold and the movable mold to form the first molded article, the second molded article, and the third molded article.
The method for manufacturing a molded article according to claim 2, wherein in the first molding step and the second molding step, molten resin is injected from an injection unit provided in the fixed mold.
The method for manufacturing a molded article according to claim 3, wherein the injection unit provided in the fixed mold comprises a first injection unit and a second injection unit, and in the molding process of the molded article, molten resin is injected from the first injection unit, and in the first molding process and the second molding process, molten resin is injected from the second injection unit.
A method for manufacturing a molded product according to claim 1, wherein the movable mold is slid to face the first molded product and the second molded product.
The method for manufacturing a molded article according to claim 1, wherein the movement of the movable mold is rotational movement in a plane opposite to the fixed mold.
A method for manufacturing a molded product according to claim 1, using a robotic arm to bring the first molded product and the second molded product facing each other.
The method for manufacturing a molded article according to claim 3, wherein the molten resin injected from the injection unit is distributed by a manifold provided in the fixed mold.
The method for manufacturing a molded product according to claim 1, wherein, after the second molding step, the slidable sliding portion of the movable mold is slid to release the engagement between the sliding portion and the third molded product.
The method for manufacturing a molded product according to claim 9, wherein the third molded product formed by the first molding step is held in the movable mold when the fixed mold and the movable mold are opened, by engaging with the slide portion.
The method for manufacturing a molded article according to claim 1, wherein in the first molding step and the second molding step, a mold is used for backup to suppress deformation of the molded article.
A manufacturing method for producing an integrally molded product including a first molded product, a second molded product, a third molded product, and a fourth molded product, using a fixed mold and a movable mold, A first molding step involves closing the molds with the first molded product held in the fixed mold and the second molded product held in the movable mold facing each other, and then joining them by pouring molten resin into the space formed by the first molded product and the second molded product to form a first intermediate integral molded product. A second molding step involves closing the molds with the first intermediate integral molded product held in the movable mold and the third molded product held in the fixed mold facing each other, and joining them by pouring molten resin into the space formed by the first intermediate integral molded product and the third molded product to form a second intermediate integral molded product. A method for manufacturing a molded product, comprising: a third molding step of closing the mold with the second intermediate integral molded product held in the fixed mold and the fourth molded product held in the movable mold facing each other, and joining them by pouring molten resin into the space formed by the second intermediate integral molded product and the fourth molded product.
A method for manufacturing a molded product, comprising forming an integral molded product using a first molded product, a second molded product, and a third molded product with a fixed fixed mold and a movable mold, A first molding step involves closing a mold with the first molded product and the second molded product facing each other, and joining them by pouring molten resin into the space formed by the first molded product and the second molded product to form a first intermediate integral molded product. The process includes a second molding step in which the first intermediate integral molded product held in the fixed mold and the third molded product held in the movable mold are placed facing each other and the mold is closed, and molten resin is poured into the space formed by the first intermediate integral molded product and the third molded product to join them, A method for manufacturing a molded product, characterized in that, in the first molding step and the second molding step, molten resin is injected from an injection unit provided in the fixed mold.
A manufacturing method for producing an integrally molded product including a first molded product, a second molded product, and a third molded product using a fixed mold and a movable mold that is movable relative to the fixed mold, A first molding step involves forming the first molded product, the second molded product, and the third molded product by introducing resin through a manifold provided in the fixed mold while the fixed mold and the movable mold are closed, With the sliding portion provided in the movable mold in contact with the third molded product, the fixed mold and the movable mold are opened, the first molded product is held in the fixed mold, and the second molded product and the third molded product are held in the movable mold. A second molding step involves closing the fixed mold and the movable mold with the first molded product held in the fixed mold and the second molded product held in the movable mold facing each other, and then pouring molten resin into the space formed by the first molded product and the second molded product to form a first intermediate integral molded product. A third molding step involves forming the integral molded product by closing the molds with the first intermediate integral molded product held in the fixed mold and the third molded product held in the movable mold facing each other, and then joining them by pouring molten resin into the space formed by the first intermediate integral molded product and the third molded product, A method for manufacturing a molded product, characterized by comprising the steps of opening the fixed mold and the movable mold and removing the integrally molded product by sliding the sliding part.

Description

This invention relates to a method for manufacturing molded articles. In recent years, to improve the reliability and strength of joints in molded products and to reduce equipment costs, a method using molten resin for joining molded products has been adopted. Specifically, multiple individual parts are molded using an injection molding machine. Then, the mold is opened and moved so that the individual parts face each other. The mold is then closed again, the molded individual parts are combined, and molten resin is poured in. Patent Document 1 discloses a method for manufacturing an integrally molded product by laminating and joining three molded products—a first molded product, a second molded product, and a third molded product—by injection molding. In the joining of molded products described in Patent Document 1, a method is disclosed in which the first and second molded products are joined together, and then the resulting product is joined to the third molded product to obtain an integrally molded product. Japanese Patent Publication No. 2021-88112 This is a diagram showing a typical injection molding machine.This is an exploded perspective view of a print head, including a single molded part consisting of three components.This is a cross-sectional view showing the joint of the first intermediate integrally molded product.This is a cross-sectional view showing the joint of a single molded product.This diagram shows how molded parts are joined together using a conventional method.This figure shows how the molded parts are joined together in this embodiment.This diagram shows the manufacturing process for a one-piece molded product consisting of three parts, in chronological order.This is an exploded perspective view of a print head, including a single molded part consisting of four components.This is a cross-sectional view showing the joint of the first intermediate integrally molded product.This is a cross-sectional view showing the joint of the second intermediate integrally molded product.This is a cross-sectional view showing the joint of a single molded product.This diagram shows the manufacturing process for a one-piece molded product consisting of four parts, in chronological order. (First embodiment) A first embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a conventional injection molding machine 100. The injection molding machine 100 consists of a fixed platen 01 that is fixed and immovable, and a movable platen 02 that can move in the direction of opening and closing the mold, positioned opposite each other. The movable platen 02 is movable within the range indicated by arrow α in the figure. A fixed mold 03 is mounted on the fixed platen 01, and an injection unit 06 for injecting resin is provided. A movable mold 04 is mounted on the movable platen 02. The fixed mold 03 may have a manifold 05 for distributing resin and an injection unit 08 for injecting resin. In the movable mold 04, it is desirable that the manifold 05 for molding the molded product and the manifold 05 for connecting the molded product have independent paths. The injection unit 06 and manifold 05 are generally provided on the fixed mold 03. The movable platen 02 has an ejector mechanism 07 that can move in the direction of arrow β, and the molded product from the movable mold 04 can be removed by the ejector mechanism 07. Figure 2 is an exploded perspective view of the print head 30, including a three-part integrally molded product 16, in this embodiment. The integrally molded product 16 included in the print head 30 is formed by joining a first molded product 17, a second molded product 18, and a third molded product 19. The third molded product 19 has a complex shape on its side surface, and its molding requires a sliding mechanism (sliding part) in which a piece can slide within the mold cavity. Figure 3 is a cross-sectional view showing the joint of the first intermediate integral molded product 32, formed by joining the first molded product 17 and the second molded product 18 with molten resin 20. Figure 4 is a cross-sectional view showing the joint of the integral molded product 33, formed by joining the first intermediate integral molded product 32 and the third molded product 19 with molten resin 20. The joining of molded parts is performed by pouring molten resin 20 into the space 31 formed when the molded parts are joined together. When pouring molten resin 20 into the space 31, the area near the space 31 through which the molten resin 20 flows is backed up by a mold backup section 21 to prevent it from being overwhelmed by the pressure of the molten resin 20. In particular, when the walls are thin, backing up is effective in suppressing wall deformation. Furthermore, as shown in Figure 3, the backup section 21 blocks the flow path 34 formed in the first molded part 17, preventing the molten resin 20 from flowing into the flow path 34. The narrower and longe