JPH0664833U - Injection mold equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the temperature control fluid leaking from the inlet / outlet of the temperature control water pipe provided in the mold from flowing out to the cavity surface. [Structure] Fixed-side mold plate 3 provided on the front surface of fixed-side mold A and movable-side mold plate 11 provided on the front surface of movable-side mold B.
Cavities 3c and 11c are formed on the respective PL surfaces. In the mold closed state, both mold plates abut each other to form the cavity C. Each of the template plates 3 and 11 has a water pipe 3d or 11d which serves as a passage for a temperature adjusting fluid in the cavity.
Has been drilled. Step portions 3f and 11f are formed near the inlet / outlet portions 3e and 11e of the water pipes on the side surfaces of both mold plates 3 and 11 so as to form a wall located in the PL surface direction. A hose 7 for supplying and discharging the temperature control fluid is connected via the. The fluid leaked from the end of the hose or the joint is accumulated in the stepped portion and is recognized, enabling immediate repair work, preventing it from flowing out to the cavity surface, protecting the cavity and preventing stains on the molded product. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection mold device.

[0002]

[Prior art]

 Since an injection molding die device injects a molten resin, which is a molding material, into a cavity defined by a fixed-side mold and a movable-side mold, and solidifies this to obtain a molded product, it is usually used. It is provided with temperature adjusting means for keeping the temperature of the mold constant. The resin, which is a molding material, has different injection temperatures depending on the type, but the temperature of the mold has a great influence on the quality of the molded product, so its temperature control is an important factor.

As a temperature adjusting means, generally, as shown in FIG. 3, a water pipe 41d for passing a temperature adjusting fluid (hereinafter referred to as "fluid") is provided in a mold plate 41 constituting an injection molding die. A hose 47 for supplying and discharging the fluid is connected to this, and the fluid is supplied from the inlet of the water pipe and discharged from the outlet. This fluid is kept at a predetermined temperature, and is circulated in the water pipe 41d to regulate the temperature of the entire mold.

Generally, the connection between the water pipe 41d and the hose 47 at the entrance / exit 41e is performed by attaching a joint 46 to the end of the hose. To attach the joint 46 to the template 41, a female screw portion is formed on the inlet / outlet portion 41e (not shown), and the screw portion of the joint 46 is screwed into the female screw portion. Instead of the joint 46, there is also one that uses a one-touch coupler that makes it easy to attach and detach the hose.

[0005]

[Problems to be solved by the device]

 As described above, if the joint between the hose 47 for supplying and discharging the fluid and the joint is loose or the hose is deteriorated, the fluid may leak from there. Similarly, when the one-touch coupler is used, fluid leakage may occur if the O-ring of the coupler deteriorates.

When the leaked fluid is water or hot water, the fluid flows along the PL (parting line) surface of the template into the cavity, corrodes the cavity surface, and prolongs the life of the mold. It causes to decrease. Further, if the fluid is oil or other fluid, if it flows into the cavity, it may stain the molded product and cause deterioration of the quality of the molded product.

As a measure for avoiding the above-mentioned inconvenience due to fluid leakage, it is possible to frequently perform mold cleaning and periodic inspection, and replace the hose that may leak fluid earlier. It is uneconomical because it requires time and labor for replacement, the down time of the injection molding machine is long, and a large amount of replacement hoses and joints are required.

Therefore, an object of the present invention is to prevent the fluid leaking from the hose from flowing into the cavity, thereby improving the life of the mold and the quality of the molded product and reducing the manufacturing cost of the injection molded product. It is to plan.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the injection molding die device of the present invention is provided with a fixed side mold having a fixed side mold plate and a fixed side mold which can be brought into contact with and separated from the fixed side mold. A movable side mold having a movable side mold plate that defines a molding cavity together with the mold, and a pair of inlets and outlets formed in at least one of the mold plates to allow the temperature control fluid to flow in or out. A water pipe having a section, a hose to which temperature control fluid is supplied or discharged, and a connecting member that connects the inlet and outlet of the water pipe are connected, and leakage from the connecting member or hose near the inlet and outlet of the template. A step is formed to prevent the temperature control fluid from flowing out to the cavity surface of the template.

[0010]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an injection molding die apparatus to which the present invention is applied includes a fixed-side die A fixed to an injection-molding machine body frame (not shown) and a reciprocating movable portion with respect to the fixed-side die. And a movable-side mold B for partitioning and forming a cavity C together with a fixed-side mold.

The fixed-side mold A includes a fixed-side receiving plate 2 that contacts the front surface (left side in the drawing) of the fixed-side mounting plate 1 and a fixed-side mold plate 3 that contacts the front surface of the receiving plate. A nozzle bush 4 into which the nozzle portion of the injection molding machine body is fitted is fixed by a locating ring 5 in a hole provided in the central portion of the fixed side mounting plate 1. The front portion of the nozzle bush 4 is formed in a tapered shape and is fitted in a tapered hole portion 2 a provided in the fixed side receiving plate 2. The tip of the nozzle bush 4 is made to coincide with the front surface of the receiving plate under the state where the mounting plate 1 and the receiving plate 2 are in contact with each other, and the template 3 can be brought into close contact with this front surface. A nozzle hole 4a is provided in the inner part of the nozzle bush 4, and a spherical concave portion 4b with which the nozzle of the injection molding machine abuts is formed at the center of the tip of the nozzle hole. A sprue portion 4c penetrating the front end portion is provided at the center of the spherical concave portion 4b.

A runner portion 3a connected to the sprue portion 4c is provided at a position corresponding to the sprue portion 4c at the center of the fixed-side template 3, and the tip of the runner portion has a cross-section with a narrowed gate. A part 3b is provided.

In the vicinity of the gate portion 3b on the front surface of the fixed side template, a cavity section 3c for partitioning and forming a cavity C of the molded product S is formed together with a movable side template described later.

Inside the stationary mold plate 3, a water pipe 3d serving as a passage for the temperature control fluid is provided so as to pass around the cavity 3c. Although only the cross-sectional shape is shown in FIG. 1, a fluid inlet port and an outlet port are provided on the upper side of the fixed-side mold plate 3, and a pair of these inlet / outlet parts 3e communicate with each other in a U-shape. A water pipe is formed in a shape that allows fluid to pass through the template. Only one of the entrances and exits 3e is shown in the drawing.

In the vicinity of the inlet / outlet part 3e of the water pipe on the side surface of the template 3, a step portion is dug into a predetermined depth and a size of a flange of a joint (connecting member) 6 described later, which can be stored. 3f is formed. From the bottom surface of the step portion 3f to the predetermined depth of the water pipe 3d, a female screw portion is engraved (not shown). Then, the male screw portion provided at one end is screwed into the female screw portion, so that the hollow cylindrical joint 6 having the flange portion is screwed into the entrance / exit portion 3e. Further, a hose 7 capable of supplying or discharging a fluid is fitted to the other end of the joint 6. In this way, the hose 7 and the water pipe 3d communicate with each other through the joint 6, and the fluid is introduced into the water pipe from the one inlet / outlet portion 3e through the hose 7 by the supply means (not shown). After circulating through the water pipe 3d, the water is discharged through the other inlet / outlet portion 3e and the hose 7.

As shown in FIG. 1, the movable side mold B includes a movable side mounting plate 8, a spacer block 9 in contact with the front surface (right side in FIG. 1), and a movable side receiver in contact with the front surface. It is provided with a plate 10 and a movable side mold plate 11 which is in contact with the front surface thereof.

On the front surface of the movable side mold plate 11, a cavity part 11 c for partitioning and forming the cavity C is formed together with the cavity part 3 c of the fixed side mold plate 3. The cavity portion 11c corresponds to the cavity portion 3c of the stationary mold plate in the center so that the shape of the molded product S is such that a thick portion is formed in the center of the disc and a hole is formed in the center. There is a large step. At the center of the cavity 11c, a core pin 12 having a head housed in a recess formed in the receiving plate 10 is attached, and a hole is formed at the center of the molded product S by the portion protruding into the cavity 11c. It can be formed.

The cavity 11c has a bottom surface at a predetermined position provided with a communication hole 11b into which a protrusion pin 13 described later can be inserted, and the movable side receiving plate 10 is also provided with a communication hole 10b communicating therewith. .

In the space 9 a provided in the spacer block 9, two projecting plates 14 are provided so as to be movable back and forth. The protruding pin 13 can protrude the molded product S in the cavity by advancing the protruding plate 14 with a cylinder rod (not shown).

Similar to the fixed side, the movable side mold plate 11 is also provided with a water pipe 11d that serves as a fluid passage, and the pair of inlet / outlet portions 11e of the water pipe are provided with joints 6 that form a connecting member, respectively. The water pipe 11d and the hose 7 are connected so that they can communicate with each other. Then, a step portion 11 f is formed on the side surface of the template 11 near the inlet / outlet portion 11 e of the water pipe 11 d.

In the injection molding die apparatus described above, the movable die B is moved forward by the cylinder ram to close the die, and the cavity C is defined by the die plates 3 and 11. A molding material resin is injected into the cavity C from a nozzle (not shown) through the sprue portion 4c and the runner portion 3a, and a predetermined curing time is taken to solidify the resin to form a molded product S.

When the movable side mold B retracts and enters the mold open state, the molded product S is cut from the runner at the gate portion 3b, and the molded product S is left in the cavity portion 11c of the movable side mold B. It becomes a state. Subsequently, a cylinder rod (not shown) pushes out the ejecting plate 14, ejecting the ejecting pin 13 into the cavity C and ejecting the molded product S. In this way, one cycle of molding process is completed.

Even if the fluid leaks during the molding operation due to looseness or breakage of the end of the hose 6 or improper installation of the joint, the leaked fluid can be stored inside the step portions 3f and 11f. Therefore, the fluid does not flow out of the hose or the like and flow into the cavity C from the parting line surface (hereinafter referred to as “PL surface”). If a certain amount of leakage is confirmed by recognizing the presence of the fluid accumulated in the stepped portion 11f during the injection molding, repair such as replacement of the hose or joint may be performed. In the first embodiment, the step portions 3f and 11f are formed so as to form walls that are located in the PL surface direction from the entrance / exit portions 3e and 11e. On the other hand, in the second embodiment shown in FIG. 2, the step portion 15 is formed so as to form a peripheral wall surrounding the entrance / exit portion 3e. According to this, there is no fear that the leaked fluid will flow out not only to the PL surface side but also to the contact surface side between the mold plate 3 and the receiving plate 2.

In the above-described embodiment, both the fixed-side mold and the movable-side mold are adopted, but it is also possible to apply it to only one of the molds depending on the design of the mold. Further, although oil is used as the temperature control fluid, the same effect can be obtained even if fluid other than oil, such as water, is used. Regarding the connecting means, a one-touch coupler or the like may be adopted instead of the join.

The present invention is not intended to limit the configuration of the injection molding die device to that shown in the drawings, and can be applied to all injection molding die devices equipped with cavity temperature adjusting means using a temperature adjusting fluid. Is.

[0026]

[Effect of device]

 As described above, according to the present invention, since the step portion is provided at the inlet / outlet portion of the temperature control fluid water pipe, even if the temperature control fluid leaks from the end of the hose or the like, the temperature control fluid remains in the step portion. , PL surface to prevent it from flowing into the cavity. Therefore, the molded product is not contaminated and the cavity is not corroded. Moreover, it is only necessary to replace the hose etc. after confirming the fluid leakage due to the fluid accumulated in the step portion, which simplifies the periodic inspection and contributes to the reduction of the manufacturing cost of the molded product.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of a second embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part of a conventional example.

[Explanation of symbols]

 A Fixed-side mold B Movable-side mold C Cavity 3 Fixed-side mold plate 3d, 11d Water pipe 3e, 11e Entry / exit part 3f, 11f, 15 Step 6 Joint (coupling member) 7 Hose 11 Movable-side mold plate

Claims (1)

[Scope of utility model registration request] 1. A fixed-side mold having a fixed-side mold plate, and a movable-side mold plate that is provided so as to be able to come in contact with and separate from the fixed-side mold and that forms a molding cavity together with the fixed-side mold. A movable side mold, a water pipe having a pair of inlet / outlet portions that are provided in at least one of the mold plates and into / from which a temperature control fluid can flow, and a hose to which the temperature control fluid is supplied or discharged. And a connecting member for connecting the inlet / outlet portion, and in the vicinity of the inlet / outlet portion of the template, the temperature control fluid leaked from the connecting member or the hose flows out to the cavity surface of the template. An injection molding die apparatus, which is characterized in that a step portion that prevents the above is formed.