JPH0570922U - Sprue bush - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Piping connection part 1 so that the cooling medium does not leak from the piping connection hole that introduces and discharges the cooling medium.
Sprue bush 1 that can be easily installed
2. [Structure] Piping connection part 17 for introducing and discharging cooling medium
A sprue bush 12 having a pair of pipe connecting holes 18 for mounting the pipe connecting holes 18 vertically opened to a mounting plane portion 20 on the same virtual plane formed on the cylindrical outer peripheral surface of the sprue bush 12. The piping component 17 can be connected and installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sprue bush provided in an injection molding device.

[0002]

[Prior Art]

 FIG. 3 is a side view showing a schematic configuration of a conventional injection molding device. The structure of the injection molding apparatus is roughly divided into an injection unit 1 and a mold clamping mechanism 2.

The injection unit 1 has a structure in which raw material resins, additives, and the like, which are put into the cylinder 4 from the hopper 3, are heated and mixed to be plasticized, and are pressurized by a plunger or a screw to be injected from the nozzle 5 at a high pressure. Is becoming

The mold clamping mechanism unit 2 divides a mold (not shown) into a plurality of pieces and attaches them to a fixed plate 6 and a movable plate 7, and a mold clamping ram 8 advances the movable plate 7 to the fixed plate 6 side for division. Molded products formed by pressing the attached molds together to form cavities, which are voids for injecting and injecting molten resin into the joints of the molds, and retracting the movable platen 7 to separate the molds from each other. Can be taken out from the mold by an ejector pin (not shown).

FIG. 4 is a cross-sectional view of essential parts showing an example of attachment of a die to a fixed plate of a conventional injection molding apparatus. A sprue bush 12 having a flow path 11 for injecting a molten resin into a cavity portion 10 of a mold 9 is mounted on the stationary platen 6, and the injection unit 1 is moved forward with respect to the mold clamping mechanism 2 during injection molding. The nozzle 5 is pressed against the flow path opening 13 of the sprue bush 12 (hereinafter referred to as nozzle touch) to inject the molten resin.

The high-temperature and high-pressure molten resin is injected and filled from the flow passage opening 13 of the sprue bush 12 into the cavity 10 via the flow passage 11 and the runner 14, and the temperature of the molten resin inside the cavity 10 drops and solidifies. Wait for, move the movable platen 7 backward, open the mold, and take out the molded product.

When the injection of the molten resin is completed, the injection unit 1 is retracted from the mold clamping mechanism section 2 and the molten resin is separated at the passage opening 13 of the sprue bush 12.

Reference numeral 15 is a guide pin bush for guiding the movement of the mold by inserting a guide pin (not shown) in order to prevent displacement of the crimping positions of both of the separately mounted molds.

[0009]

[Problems to be solved by the device]

 As described above, the injection molding process comprises the steps of injecting a high-temperature and high-pressure molten resin into the cavity 10, waiting for cooling and solidification, taking out from the mold, and forming the cavity again.

[0010] Of the above-mentioned processes, the high-speed and high-efficiency of the process in which the high-temperature, high-pressure molten resin is cooled and solidified to form a molded product is achieved by rapidly cooling the molded product without causing any undesired residual stress. is there. For that purpose, temperature control of each part such as the mold 9, the sprue bush 12, the fixed plate 6 and the like is an issue, and a cooling medium flow path for cooling with water, air or the like is provided at necessary places.

The sprue bush 12 may also be provided with a pair of pipe connection holes to connect pipes for introducing and discharging a cooling medium such as water to improve efficiency.

However, the pipe connection hole is opened in the cylindrical outer peripheral surface of the sprue bush, and the female screw is simply cut so that the pipe connection component such as the nipple connected to the tip of the cooling medium pipe can be screwed. For this reason, there is a problem that the cooling medium leaks from the pipe connection hole portion where the pipe connection parts are mounted after the cooling medium pipe is removed and maintained, inspected, and the mold is replaced.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and the pipe connection is made so that the cooling medium does not leak from the pipe connection hole portion for introducing / discharging the cooling medium. The purpose is to provide a sprue bush that allows easy mounting of parts.

[0014]

[Means for Solving the Problems]

 Therefore, the sprue bush according to the present invention is a sprue bush having a pair of pipe connection holes for mounting pipe connection parts for introducing and discharging a cooling medium, and the pipe connection hole is the cylindrical outer periphery of the sprue bush. In order to achieve the above-mentioned object by a configuration characterized in that the piping parts can be connected / installed by opening vertically in two mounting plane parts formed on the same virtual plane formed on the surface. is there.

[0015]

[Action]

 Since the pipe connection hole is opened in the mounting plane part on the same virtual plane formed on the cylindrical outer peripheral surface of the sprue bush and perpendicularly to the mounting plane part, it can be used as a pipe connection part for introducing and discharging the cooling medium. The end face can be easily and surely brought into close contact with the mounting flat surface, and since the pair of pipe connection parts are mounted in parallel on the sprue bush, the cooling medium is introduced from the pipe connection hole part for introducing and discharging the cooling medium. Piping connection parts can be easily installed to prevent leakage.

[0016]

【Example】

 Hereinafter, a sprue bush according to the present invention will be described with reference to examples. FIG. 1 is a vertical sectional view of an embodiment of the present invention, showing a state in which piping parts are connected. FIG. 2 is a cross-sectional view showing the main part of the same embodiment. The same or corresponding parts as those of the conventional sprue bush are designated by the same reference numerals.

The sprue bush 12 of the embodiment has a pair of pipe connection holes 18a and 18b for mounting a pipe connection component 17 such as a nipple connected to the end of the pipe 16 for supplying and discharging a cooling medium such as water. The cooling medium is introduced from one of the pipe connection holes 18a to flow into the cooling medium passage 19, and the cooling medium is discharged to the outside of the sprue bush 12 from the other pipe connection hole 18b. The structure of the other parts conforms to the structure of the conventional sprue bush.

The pipe connection holes 18a, 18b are opened in the mounting plane portions 20a, 20b formed by cutting two portions of the cylindrical outer peripheral surface of the sprue bush 12, and the inner surfaces of the pipe connection holes 18a, 18b are A female screw for connecting / mounting the pipe connecting component 17 is cut.

The mounting plane portions 20a and 20b are on the same virtual plane xx, and the pipe connecting holes 18a and 18b are opened perpendicularly to the mounting plane portions 20a and 20b.

With the above configuration, the pipe connection holes 18a and 18b are mounted on the mounting plane portions 20a and 20b on the same virtual plane xx formed by cutting two portions of the cylindrical outer peripheral surface of the sprue bush 12 and are mounted. Since the openings are perpendicular to the flat surface portions 20a and 20b, the end surface of the pipe connection component 17 for introducing and discharging the cooling medium can be easily and securely brought into close contact with the mounting flat surface portions 20a and 20b. Since the pipe connecting parts 17 are mounted in parallel to the sprue bush 12, the pipe connecting parts 17 are easily installed so that the cooling medium does not leak from the pipe connecting holes 18a and 18b for introducing and discharging the cooling medium. Can be attached to.

[0021]

[Effect of the device]

 As described above, according to the present invention, the pipe connection hole is opened in the mounting plane portion on the same virtual plane formed on the cylindrical outer peripheral surface of the sprue bush, and vertically to the mounting plane portion. The end face of the pipe connection component that introduces and discharges the cooling medium can be brought into close contact with the mounting flat surface easily and securely, and since the pair of pipe connection components are mounted in parallel on the sprue bush, the cooling medium is introduced. -Pipe connection parts can be easily installed so that the cooling medium does not leak from the pipe connection holes that are discharged.

Then, the cooling efficiency of the sprue bush or related members can be improved, and the speed and efficiency of injection molding can be increased.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment.

FIG. 2 is a cross-sectional view of one embodiment.

FIG. 3 is a side view of a conventional injection molding device.

FIG. 4 is a cross-sectional view of a main part of a conventional injection molding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection unit 2 Clamping mechanism section 4 Cylinder 5 Nozzle 6 Fixed plate 7 Movable plate 9 Mold 10 Cavity part 11 Flow path 12 Sprue bush 13 Flow path opening 14 Runner 17 Piping connection parts 18a, 18b Piping connection hole 19 Coolant flow Roads 20a, 20b mounting plane part

Claims (1)

[Scope of utility model registration request] 1. A sprue bush having a pair of pipe connecting holes for mounting pipe connecting parts for introducing and discharging a cooling medium, wherein the pipe connecting holes are the same virtual plane formed on a cylindrical outer peripheral surface of the sprue bush. A sprue bush characterized in that the piping parts can be connected and mounted by opening vertically in the two upper mounting plane portions.