JPH0743608U - Cooling water fittings - Google Patents

Abstract

(57) [Summary] [Purpose] Efficiently cool only the tip of a spot cooling water fitting. [Structure] A movable core or a fixed core, in particular, a collar that holds a flange of the spot cooling hole of a core pin when the metal fitting of the step is fitted, and the tip reaches the cooling hole to approximately the center. The attached tubular body is attached by joining a member having a hole for fitting and fixing the inflow water thin tube at the tip of the tubular body and having a spiral fin on the outer periphery.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improved mold cooling.

[0002]

[Prior art]

 Generally, in injection molding, after the molten material is pressed in, the mold is cooled and the molten material is solidified early and taken out as a product from the mold. As the cooling method, a spot type cooling water fitting as disclosed in Japanese Patent Application No. 4-100546 is used. However, in the case of cooling the core pin 1 having a deep cooling hole as shown in FIG. 1, there is not much difference in cooling energy between the pin tip 2 and the root 3, and conversely the heating energy is concentrated on the pin tip 1. Therefore, the pin tip 1 becomes overheated.

In addition to the above, after the mold-opened product is taken out, the mold release agent solution is spray-dispersed over the entire cavity 4 to substantially remove the heat of solidification for each molding, and at the same time improve the mold releasability. In such a case, the pin tip 2 part of the product will finally solidify and form a porosity, so it is necessary to focus on the pin tip 2 and adjust the temperature. When the agent solution has evaporated, the roots are overcooled when the molding times are repeated, the release agent solution does not evaporate, and the residual water of the release agent solution that has been sprayed stays in it and melts at high temperature in the mold. When the material is press-fitted, the residual water comes into contact with the molten material and is instantly vaporized and expanded to be gasified and mixed into the product, resulting in a pin pole or a hot water boundary, which causes defects.

[0004]

[Problems to be solved by the device]

 Therefore, the problem to be solved by the present invention is to prevent the residual water phenomenon from occurring in the root cavity of the core pin.

[0005]

[Means for Solving the Problems]

 For that purpose, a hole for supporting the cooling water inflow thin tube is provided at the tip of the tubular body so that the tubular body having a collar formed on the rear side is sandwiched between the step portion and the outflow member of the cooling water fitting by the collar. Then, connect a fin member with a fin that extends the length of the running water to the outer periphery, insert it into the cooling hole, and insert a cooling water fitting from the rear.

[0006]

[Action]

 Then, the cooling water reaches the tip of the cooling hole through the inflow narrow tube, and then flows between the outer fins of the member. At that time, the contact area per flow rate between the cooling water and the tip of the pin is increased by the fins, and the cooling capacity is increased. Then, after flowing between the outer fins of the member, the cooling water flows out of the inside of the cylindrical body, so that it does not directly contact the core pin and does not overcool the root cavity of the core pin, but goes to the outlet of the cooling water metal fitting. . As described above, the tip of the pin to be cooled is efficiently cooled, the root cavity of the pin or core pin is not overcooled, and the release agent solution that does not fall due to gravity evaporates by the mold clamping and causes water remaining phenomenon. Can not be born.

[0007]

【Example】

 First, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows the fixed mold 6 and the movable mold 7 attached to the machine 5, in which the molten metal 8 is poured into the sleeve 9 and the piston 10 does not move forward. Further, a cavity 11 is provided on the mating surface between the fixed mold 6 and the movable mold 7, and the core pin 12 defines the deep hole of the product. FIG. 3 shows an improved spot type cooling metal fitting 13 of the present invention, in which a protective tube 15 is inserted into a cooling hole 14 of a core pin 12 with a spiral fin member 16 joined to the tip thereof. A cooling water outlet member 18 is inserted into a rear portion of the collar 17 of the protective tube 15 into an inlet portion 19 of the cooling hole 14 of the core pin 12 via an O-ring 20. Further, a cooling water inlet member 21 is fitted to the rear portion of the cooling water outlet member 18 via an O-ring 22. Further, an inflow thin tube 23 penetrates the cooling water outlet member 18 in the cooling water inlet member 21, and a tip of the inflow thin tube 23 is supported by a hole of the fin member 16.

Further, a holding metal fitting 24 is fixed to a holder 25 in order to keep the fitting stable. Further, a hose (not shown) is connected to the cooling water outlet member 18 and the cooling water inlet member 21 via screws 26 and 27. Reference numeral 28 denotes a movable core, which forms a cavity 29 in a space with a fixed core (not shown). The core pin 12 is fixed by a movable core 28 and a holder 25 with a collar 30 sandwiched between them. The cavity pin 29 is formed continuously with a root 31 having an R shape. FIG. 4 and FIG. 5 show a fin member 31 of another embodiment, in which a hole 32 into which the inflowing thin tube 23 is fitted is centered and a plurality of fins 33 are arranged and formed in a zigzag pattern on the outer periphery. Has been done.

Next, the present invention will be described with reference to the drawings. Usually, during passage of the cooling water, the cooling water passes through the cooling water inlet member 21 and reaches the cooling hole 14 from the tip of the inflow thin tube 23. The tip of the core pin 12 is cooled and guided by the spiral fin member 16 to cool the vicinity of the tip of the core pin 12 while increasing the contact area per flow rate of cooling water. After that, it flows toward the cooling water outlet member 18, but since the protection tube 15 is present, the core pin 12 is rarely cooled. On the other hand, the core pin 12 is heated more than other parts of the cavity because the molten metal 8 wraps the tip of the core pin every time molding is repeated. Aimed at and sprayed. Therefore, if the core 31 should be supercooled by cooling the inside and outside of the core pin, the protective pipe 15 hinders the internal cooling of the base 31. Therefore, the core pin 12 has both the tip and the base depending on the heat quantity of the molten metal 8. Cooling is achieved, and even if the mold release agent solution is spray-sprayed on the cavity surface of the core pin 12 to cool the surface of the cavity, the mold release agent solution evaporates almost uniformly and no residual water phenomenon occurs. The fin member 31 of the other embodiment also has the same function as the spiral fin member 16 and is not limited to these as long as the area in contact with the cooling water increases. If necessary, the protective tube 15 may be provided with a hole through which the cooling water comes into contact with the inner surface of the core pin 12.

[0011]

[Effect of device]

 After spraying the mold release agent solution on the cavities in this way, the mold release agent solution evaporates by the time the mold is clamped and water residue is prevented from occurring near the root of the core pin. It was possible to prevent the generation of defective products without entrainment or hot water.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional core pin cooling fitting.

FIG. 2 is a machine mounting view of a molding die.

FIG. 3 is a vertical sectional view of a core pin cooling fitting of the present invention.

FIG. 4 is a vertical sectional view of a fin member of another embodiment.

FIG. 5 is a side view of a fin member according to another embodiment.

[Explanation of symbols]

 1 Core Pin 2 Pin Tip 3 Base 4 Cavity 5 Machine 6 Fixed Die 7 Movable Die 8 Molten Metal 9 Sleeve 10 Piston 11 Cavity 12 Core Pin 13 Spot Cooling Metal Fitting 14 Cooling Hole 15 Protective Tube 16 Spiral Fin Member 17 Collar 18 Cooling Water Outlet Member 19 Inlet 20 O-ring 21 Cooling Water Inlet 22 O-ring 23 Inflow Tube 24 Holding Metal Fitting 25 Holder 26 Screw 27 Screw 28 Movable Core 29 Cavity 30 Collar 31 Fin Member 32 Hole 33 Fin 34 Cutout

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29C 45/78 7365-4F

Claims (1)

[Scope of utility model registration request] 1. A spot type cooling water fitting for cooling a core pin of a molding die, wherein a step portion of a core pin cavity near a step portion of a cooling hole at a rear portion of the core pin through which cooling water flows. A cylinder body for preventing overcooling is joined by assembling and inserting a member having a hole at the tip of the cylinder body for supporting a cooling water inflow thin tube and a fin provided on the outer periphery with a fin for extending the passage of flowing water. Cooling water fittings that are characterized.