JPH069919U - Mold for molding - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent continuous sliding by preventing sliding failure of the slide core of the molding die, and to eliminate stains on the molded product. [Structure] In a molding die 2 having a slide core 4, the slide core 4 has a hard chrome plating layer on a nitriding layer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a molding die.

[0002]

[Prior art]

 The sliding core sliding parts of conventional molding dies had increased hardness due to flame quenching, etc., but as the number of shots increased, mold galling occurred and continuous molding was not possible due to sliding failure problems. Had a problem such as causing

[0003]

[Problems to be solved by the device]

 Therefore, it is an object of the present invention to provide a molding die having a slide core that can prevent continuous sliding by preventing the sliding core from sliding, and can eliminate stains on the molded product.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above points, and is characterized by a mold having a slide core, in which the surface of the slide core has a hard chrome plating layer on the nitriding layer. It is in the mold.

[0005]

[Action]

 Since the surface of the slide core has a hard chrome plating layer on the nitriding layer, the Vickers hardness is about 1200 kg, and since it becomes harder, there is no metal scuffing and continuous molding becomes possible. By eliminating the occurrence of galling, contaminants will not come out and the molded product will not become dirty.

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings of an embodiment. The present invention is not limited to these embodiments.

FIG. 1 is a sectional view of a part of a mold having four slide cores according to the present invention, showing a part of one slide core. One is a mold 2 for forming a box-shaped molded product 1 having a large V-shaped undercut groove 3 around the side surface of about 2 kg by injection molding. The V-shaped undercut groove 3 is formed by the slide core 4. The slide core 4 is moved left and right by the finger pin 5. After molding, when the mold 2 is opened, the slide core 4 is moved to the left by the finger pin 5, which does not hinder the molded product 1 from being separated from the mold 2. After the mold cleaning, when the mold 2 is closed, the slide core 4 is moved to the right by the finger pin 5 and set at a position where a predetermined molded product shape is formed. In this way, the slide core 4 slides left and right each time it is molded. In the case of a large-sized molded product 1, the slide core 4 also becomes larger by that amount, and die scuffing of the slide core 4 due to sliding is likely to occur. The slide core 4 of the present invention further has a hard chrome plating layer on the nitriding layer on the surface of the slide core mold. In this case, the surface hardness of the slide core mold was remarkably hard as Vickers hardness of about 1200 kg, and the mold galling did not occur, and continuous molding became possible. In addition, the stains on the molded product caused by the galling of the mold were eliminated. Furthermore, the durability of the mold is also improved.

As the method and conditions for the nitriding treatment of the mold and the hard chrome plating, those methods and conditions that are usually used can be used as they are.

Examples of the resin of the molding material that can be used for the molding die of the present invention include thermosetting resins such as phenol resin, unsaturated polyester resin, polyimide resin, melamine resin, and silicone resin, and saturated polyester resin, A thermoplastic resin such as an acrylic resin, a polyimide resin, a fluororesin, a polyphenylene oxide resin, or a polyphenylene sulfide resin may be used alone, modified based on these resins, or a mixture of these resins may be used in combination.

In addition to the above-mentioned amount of resin, 40% to 60% by weight (hereinafter simply referred to as “%”) of filler is used in the molding material. Examples of the filler include inorganic fillers such as aluminum hydroxide, talc, silicon oxide and aluminum oxide, metal fillers and organic fillers such as polyester resin and polyimide resin, and these fillers such as fibers, powders and particles. It can be added in the form. Generally, a release agent, a coloring agent, a plasticizer, a flame retardant, etc. can be appropriately used depending on the application.

[0011]

[Effect of device]

 The molding die having the slide core of the present invention can prevent sliding defects and enable continuous molding, and can eliminate stains on molded products due to sliding defects.

[Brief description of drawings]

FIG. 1 is a sectional view showing a molding die according to an embodiment of the present invention.

[Explanation of symbols]

 1 Molded product 2 Mold 3 Undercut groove 4 Slide core 5 Finger pin

Claims (1)

[Scope of utility model registration request] 1. A mold having a slide core, wherein the surface of the slide core has a hard chrome plating layer on the nitriding layer.