JP3407557B2 - Resin mold - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a resin flow path (runner) inside a mold, and a resin generated at an inlet (a sprue) of a resin inflow hole. The present invention relates to a resin molding die configured to prevent dripping. 2. Description of the Related Art In a conventional resin molding die, a flat plate 10 made of a metal material as shown in FIG. And the flow of resin is controlled to prevent dripping of the resin such as stringing occurring at the inlet of the resin inflow hole. [0003] However, in the configuration using the above-mentioned conventional flat plate-shaped plate 10, the flow is not smooth because the molten resin hits the flat portion of the plate 10. If the temperature of the resin drops sharply and the resin between the inlet and the plate is completely solidified and cannot be melted again in the next new injection step and the injection operation is not performed, or the resin temperature and the thickness of the plate In some cases, there is no sufficient heat radiation effect, and resin dripping such as stringing that occurs when the mold is opened in a semi-molten state has occurred, making it difficult to perform continuous and stable resin molding. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a resin molding die capable of continuously and stably molding a resin for molding at various temperatures, particularly at a high temperature. . [0005] In order to solve the above-mentioned problems, the present invention provides a blade and a gap having a sharp end section on one side of a plate, and the blade and the gap are formed by a resin molding die. In this configuration, the resin is buried above the resin inflow hole so as to divide the resin in the resin inflow direction. According to the present invention, continuous and stable resin molding without resin dripping can be easily realized. DETAILED DESCRIPTION OF THE INVENTION According to a first aspect of the present invention, the tip section comprising a gap portion on one side of the plate provided with arcuate cutouts tapered inlet of the resin inlet hole of
An arc-shaped notch having a width of an opening smaller than the diameter is buried in an upper portion of the resin inflow hole of the resin inflow main body so as to divide the resin in the resin inflow direction, and a lower portion of the resin inflow hole and a product formation. And a resin flow path provided in the portion, and a tapered arc-shaped notch having a void portion to gradually lower the heat radiation temperature of the molten resin and It has the function of cutting and separating the resin. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a resin inflow portion according to an embodiment of the present invention, FIG. 2 is a perspective view and a sectional view of a plate for preventing resin dripping, and FIG. It is principal part sectional drawing. In FIG. 1 to FIG. 3, reference numeral 1 denotes a plate-shaped resin dripping prevention plate made of a heat conductive metal material or the like. Is the diameter of the inlet of the resin inlet hole 5.
The width of the opening is 0.5 to 1.0 times the diameter of the inlet of the resin inflow hole 5 and the depth is 0.3 to 1.0 times the width of the opening. A 0.8-fold arc-shaped notch 2 is formed. Reference numeral 6 denotes a two-stage cylindrical resin inflow body made of a metal material or the like having different outer diameters. The resin inflow hole 5 through which a molding resin flows in and moves through a central portion. An arc-shaped notch 2 is placed above the resin inflow hole 5 having a larger outer diameter of the main body 6, and a concave cut groove 4 is formed so that the plate 1 is tightly embedded so as to divide the injected molding resin into two parts. Is provided. The plate 1 and the resin inflow main body 6 constitute a resin inflow portion. Numeral 8 denotes a molding die body for performing resin molding, into which a resin inflow main body 6 in which the plate 1 is buried is inserted and mounted at a predetermined position, and a resin inflow hole 5 of the resin inflow main body 6 is provided.
And one or a plurality of product forming sections 7 provided at the tip thereof. A predetermined molten molding resin is injected from the inlet of the resin inflow hole 5 of the resin inflow main body 6, and is substantially divided into two at the notch tip 3 of the plate 1 for preventing resin dripping, so that the resin inflow hole 5 is formed. The resin passes through the resin flow path 9 of the molding die body 8 and reaches the product forming section 7. In order to supply the molten molding resin to the injection port of the resin inflow hole 5, in addition to injection from a general injection molding machine, the molding resin called a hot runner system is maintained in a molten state. It is also possible to inject from a possible resin supply device. Next, the operation will be described. The molten resin injected into the inlet of the resin inlet hole 5 of the resin inlet body 6 flows from the plate 1 to the molding die body 8 via the resin inlet hole 5 of the resin inlet body 6. As the resin passage is narrowed, the contact area with the molten resin gradually increases, and accordingly, the heat of the molten resin is gradually removed, the viscosity is gradually increased, and the semi-molten state is promoted. The resin gradually deprived of heat is supplied to the resin inlet 5
Through the resin flow path 9 of the molding die body 8 through the product forming portion 7
Going to be injected. Immediately before the resin injection is completed, the flow rate of the resin decreases, and solidification starts from the tapered notch tip 3 (blade portion) in the gap formed by the arc-shaped notch 2 of the plate 1. Spread throughout the department. In other words, it becomes as if plugged with semi-molten resin in the void,
This prevents problems such as resin dripping. When the main body of the molding die is opened, it is separated from the molten portion at the lower part of the plate 1. In the next injection step, the semi-solidified resin remaining in the voids becomes molten or semi-molten due to the heat of the new molten resin, and the notch tip 3 of the plate 1 serves as a cutting blade. If it is in a semi-molten state, the resin is cut and poured into the resin inflow hole 5 of the resin inflow main body 6, and the resin injection port portion is opened again. As described above, according to the present invention, the flow of the resin is made smooth and the heat is gradually removed from the resin injection port. Since there is no possibility of molding failure due to solidification of, the advantageous effect of stably improving the productivity can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration perspective view of a resin inflow portion according to an embodiment of the present invention. FIG. 2 is a perspective view and a cross-sectional view of a plate for preventing resin dripping. FIG. FIG. 4 is a perspective view of a conventional plate for preventing resin dripping. [Description of symbols] 1 plate 2 arc-shaped notch 3 notch tip 4 concave notch 5 resin inflow hole 6 Resin inflow body 7 Product forming section 8 Molding die body 9 Resin flow path

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroaki Higashino 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References Japanese Utility Model Sho-63-7510 (JP, U) Japanese Utility Model Hei 5- 39925 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33/00-33/76

Claims (1)

(57) [Claim 1] An arc-shaped notch having a tapered tip cross section serving as a gap is provided on one side of a plate, and the resin inflow hole is provided.
An arc-shaped notch having an opening width equal to or less than the diameter of the injection port is embedded in an upper portion of the resin inflow hole of the resin inflow main body so as to divide the resin with respect to the resin inflow direction. A resin molding die formed by connecting a lower portion and a resin flow path provided in a product forming section.