JPH09327761A - Injection molding method and its die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting by mounting a core puller to operate a slide core having a core as cast by a hydraulic cylinder on a movable die plate, and minimizing the pulling force to pull out the core as cast from a casting before opening a die of the core as cast to miniaturize the hydraulic cylinder to be used for the core puller. SOLUTION: In a fixed die 8, an ejector pin 2, a guide bush for an ejector guide pin 2a, a return pin 4, an ejection plate 5, an ejection plate stopper 6, etc. are movably stored on a die base 1. A movable die 7 to be guided to a guide pin 9 of the fixed die 8 is joined with the die base 1 to form a cavity C by the fixed die 8 and the movable die 7. In the movable die 7, a slide core 13 having a core as cast 17 is movably mounted to the fixed die 8 in the direction orthogonal to the moving direction of a movable die plate, and an inclined pin hole 16 is provided on the slide core 13, an inclined pin 12 having a flange part on its end part is freely fitted to the inclined pin hole 16 to be engaged with a stopper 11. A core puller 14 which slides the slide core 13 having the core as cast 17 by interposing a spring 15 is mounted on the movable die 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method and a mold device therefor.

[0002]

2. Description of the Related Art Conventionally, a slide core with a core for casting has been used for molding a die cast product using a core for casting. This slide core with cast core is a slide core with cast core in which a core puller is mounted on a moving die plate is operated by a hydraulic cylinder, and the cast core is removed from the cast product after the mold opening operation. It was a thing.

However, when a relatively long die-casting core is used, the cast molded product is cooled, so that the solidification shrinkage of the aluminum on the outer periphery of the casting core progresses and the aluminum solidifies, and the casting core In some cases, it was difficult to pull out from the cast molding.

[0004]

According to the prior art, there were the following technical problems.

Conventionally, it takes a lot of time because the hydraulic cylinder used for the core puller has to be made large and the moving distance is long. Further, it is necessary to give sufficient consideration to the cooling of the core for casting, the uniform film thickness of the mold releasing agent in the core for casting, and the type of mold releasing agent.

The present invention has been made in view of the prior art. The object of the present invention is to mount a slide puller having a core for casting on a moving die plate and mount a core puller which is operated by a hydraulic cylinder to open the mold. An injection molding method and a mold apparatus for obtaining a cast molded product by miniaturizing the hydraulic cylinder used for the core puller to minimize the ejection force for extracting the cast core from the cast molded product before operation. To provide.

[0007]

In order to solve the above problems, an injection molding method and a mold apparatus thereof according to the present invention have the following means.

According to the injection molding method of the present invention, a mold equipped with a casting core is used to inject a molten metal into a cavity. In the injection molding method, a stopper and an inclined pin are provided on a mold on the fixed die plate side. The moving die plate is equipped with a core puller for sliding a slide core with a cast core, and a die on the moving die plate side is provided with an inclined pin hole into which the inclined pin can be inserted. When tightening, advance the core to the extent that the tilt pin can be used by the core puller in advance, then move the moving die plate to insert the tilt pin into the tilt pin hole and insert the casting core into the cavity. To be done. After injecting the molten metal into the cavity and molding, the tilt pin acts on the tilt pin hole by opening the mold, slightly pulling out the casting core from the casting molding, and then attaching the casting core by the core puller. In this method, the slide core is retracted, and the casting core is pulled out from the casting molded product.

The mold apparatus of the present invention is an injection molding apparatus for injecting a molten metal into a cavity by using a mold equipped with a casting core, and a stopper and an inclined pin are provided on the mold on the fixed die plate side. The moving die plate is equipped with a core puller that operates with a hydraulic cylinder that slides a slide core with a casting core, and the tilt pin allows the tilt pin to be inserted into the mold on the moving die plate side. Pin holes are provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A mold apparatus according to an embodiment of the present invention will be described below with reference to the sectional view shown in FIG.

In FIG. 1, a fixed die plate FD and a movable die plate ID are respectively fixed die 8 and movable die 7.
Has been fixed. Known members such as the ejector pin 2, the guide bush 3 for the ejector guide pin 2a, the return pin 4, the pushing plate 5, and the pushing plate stopper 6 are movably accommodated in the fixed mold 8 in the die base 1.
The movable die 7 guided by the guide pins 9 of the fixed die 8 is joined to the die base 1, and the cavity C is formed by the fixed die 8 and the movable die 7.

The movable mold 7 has a fixed mold 8 and a casting core 1
The slide core 13 with 7 is mounted so as to be movable in a direction orthogonal to the moving direction of the moving die plate. An inclined pin hole 16 is provided in the slide core 13, and a flange portion 12 is provided at the end.
The inclined pin 12 with the a formed therein is loosely fitted in the inclined pin hole 16 so as to engage with the stopper 11.

The movable mold 7 is equipped with a core puller 14 for sliding a slide core 13 with a casting core 17 with a hydraulic cylinder through a spring 15.

The operation of this apparatus will be described.

At the time of mold clamping, the slide core 13 is advanced in advance by the core puller 14 to the range where the tilt pin 12 can be used, and then the moving die plate ID is moved to insert the tilt pin 12 into the tilt pin hole 16. After the casting core 17 is inserted into the cavity C and the molten metal is injected into the cavity and molded, the tilt pin 12 and the tilt pin hole 16 are opened by opening the mold.
, The slide core 13 with the casting core 17 is retracted by the core puller 14, and the casting core 17 is pulled out from the casting molded product. Finish the work.

According to this embodiment, the tilting pin 12 is loosely fitted in the tilting pin hole 16 to separate the casting core 17 from the casting molded product in the cavity C. The hydraulic cylinder used for the core puller 14 can be downsized, and a cast product can be obtained in a shorter time than before.

[0017]

According to the present invention, since the tilting pin is loosely fitted in the tilting pin hole to separate the casting core from the casting product in the cavity, the pulling-out force for pulling out is minimized, and thus the core puller is provided. The hydraulic cylinder used for 14 can be downsized, and a cast product can be obtained in a shorter time than before.

[Brief description of drawings]

FIG. 1 shows a cross-sectional view of a mold device of the present invention.

[Explanation of symbols]

 C Cavity 7 Movable mold 8 Fixed mold 11 Stopper 12 Inclined pin 13 Slide core with cast core 17 Cast core 14 Core puller 15 Spring 16 Inclined pin hole

Claims (2)

[Claims] 1. A fixed die plate side mold is provided with a stopper and an inclined pin, and a movable die plate is equipped with a core puller for sliding a slide core with a casting core, and the movable die plate side. In the injection molding method in which the mold is provided with a tilted pin hole into which the tilted pin can be inserted, and a molten metal is injected into the cavity by using a mold equipped with a core for casting, the core plug is preliminarily set at the time of mold clamping. -Advancing the core to the range where the tilt pin can be used, then moving the moving die plate to insert the tilt pin into the tilt pin hole, insert the casting core into the cavity, and remove the molten metal. After injection and molding in the cavity, it is possible to slightly pull out the casting core from the casting molding by the inclined pin by the mold opening, and then pull out the casting core from the casting molding by the core puller. Features and Injection molding how. 2. A mold on the fixed die plate side is provided with a stopper and an inclined pin, a movable die plate is equipped with a core puller for sliding a slide core with a cast core, and the movable die plate is further provided. A mold device, wherein a mold pin on the side is provided with a tilt pin hole into which the tilt pin can be inserted.