JPH05285Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a casting device for casting, and particularly to a casting device having a casting pin for low-pressure casting.

(Prior art) Conventionally, in mold casting such as die casting, a core for casting is provided in a cavity formed between an upper mold and a lower mold so as to be freely retractable, and a recess is formed in a part of the molded product. This is well known, and casting equipment in which a drive cylinder is attached to the rear end of the core in order to move the core into and out of the cavity is well known (for example, -Refer to Publication No. 17684).

In addition to the above-mentioned core, a cast-out pin that can be freely retracted from the cavity is sometimes used for casting, but like the above-mentioned core, when a drive cylinder is attached to the cast-out pin, oil or air Considering the piping, etc., the structure of the mounting part becomes complicated and a device for controlling the timing of operation of the cylinder is required, resulting in an increase in cost.

(Purpose of the invention) In view of the above-mentioned problems, the present invention makes it possible to perform the retracting operation at low cost without complicating the mounting structure of cast members such as cast pins in the casting equipment. The purpose is to provide a casting equipment that can

(Structure of the invention) The casting device of the invention has a casting member in the upper mold that can freely appear and retract into the cavity formed between the upper mold and the lower mold, and the lower mold has a molding member that can be moved up and down by the upper mold. A cam member is provided that causes the casting member to move in and out as the casting member moves, and an arm that can come into contact with the cam member of the lower die is linked to the casting member, and the arm has the following functions: The cast member is characterized in that a weight is provided to maintain the retracted posture of the casting member after casting.

(Embodiment) Hereinafter, as one embodiment of the present invention, a cast-out device of a low pressure casting facility for molding a cylinder block (hereinafter referred to as a molded product W) will be described with reference to Figs. 1 and 2.

The upper mold 1 consists of a fixed mold 2 and a plurality of slide molds 3, and forms a cavity 5 between it and the lower mold 4.

Some slide molds 3a among the above slide molds 3
A cast-out pin 6 as a cast-out member that can freely move in and out of the cavity 5 and a guide hole 7 in which the cast-out pin 6 can slide are provided. Moreover, this slide mold 3a has a support part 18 that engages with the hole 8 of the cast pin 6 to support the cast pin 6 at one end, and has an arm 10 having a balance weight part 9 at the other end as a rotation axis. I support you.

The upper mold 1 is supported by an upper mold platen 11 and is movable up and down (drive means not shown), and the slide molds 3 and 3a slide horizontally with respect to the fixed mold 2 (drive means not shown). (not shown) can be freely provided.

On the other hand, a cam member 13 having an engaging portion 12 that engages with the balance weight portion 9 of the arm 10 is fixed to the lower die 4 .

Next, the operation of the casting apparatus described above, including the casting process, will be explained.

As shown in FIG. 1, an upper mold 1 consisting of a fixed mold 2 and a plurality of slide molds 3 is set on a lower mold 4.

At this time, the tip of the cast pin 6 protrudes into the cavity 5. Then, the molten metal is transferred from the crucible (not shown) through the stalk (not shown) to the sprue part 14 of the lower mold platen 19 and the sprue part 15 of the lower mold 4.
and is filled into the cavity 5. In order to prevent the casting pin 6 from retreating due to the molten metal pressure, the cam member is provided with a regulating portion 16 that comes into contact with the balance weight portion of the arm 10.

After a predetermined time, when the molten metal solidifies, the upper mold 1 (fixed mold 2 and sliding molds 3, 3a) is raised relative to the lower mold 4.

As the upper mold 1 rises, the balance weight part 9 of the arm 10 that supports the casting pin 6 and the engaging part 12 of the cam member 13 of the lower mold 4 engage with each other.
The cast pin 6 retreats from inside the molded product W.

Then, as shown in FIG. 2, the cast pin 6
When the arm 10 is completely removed from the molded product W, the supporting part 18 side of the cast-out pin 6 and the balance weight part 9 side are balanced around the rotation axis, and the cast-out pin 6 is moved forward from the retreated position again. Then hold the posture so as not to move. As a result, when the upper mold 1 is lowered relative to the lower mold 4 when casting is performed next time, the casting pin 6 is inserted into the guide hole 7 of the slide mold 3a.
can be advanced and reliably protruded into the cavity 5.

In addition, since the molded product W after casting remains in the rising upper mold 1, the casting pin 6
After it is completely removed from the molded product W, the slide molds 3 and 3a are moved horizontally relative to the fixed mold 1 at the upper end position of the upper mold 1 to pull it away from the molded product W, and at the same time, the slide molds 3 and 3a are removed from the molded product W. The ivy molded product W is fixed to the fixed mold 2 by a plurality of ejector pins 17, 17, ...,
The casting process is then separated and carried out, completing the series of casting processes.

Although this embodiment deals with a cylinder block as a molded product, it goes without saying that the present invention is not limited to this embodiment and can be applied to any cast product that requires casting.

Further, in this embodiment, the installation is for low-pressure casting, but it goes without saying that the present invention can be applied to any casting equipment having cast members.

(Effect of the invention) As is clear from the above, in the casting device of the present invention, the casting member is attached to the upper mold, and the casting member is moved by the cam member of the lower mold in the process of moving the upper mold up and down. Since it can be moved in and out of the cavity between the upper and lower molds, the mounting structure as a casting device can be simplified, and the movement of the casting member in and out can be performed at low cost.

[Brief explanation of the drawing]

Fig. 1 is a state diagram showing the setting state of the casting member (casting pin) in the cavity in the embodiment of the present invention, and Fig. 2 is a state diagram showing the state when the casting member is retreated when the upper die is raised. FIG. 1... Upper mold, 4... Lower mold, 5... Cavity,
6... Cast-out pin (cast-out member), 9... Balance weight part, 10... Arm, 13... Cam member.

Claims (1)

[Scope of utility model registration request] The upper mold has a cast member that can freely move in and out of a cavity formed between the upper mold and the lower mold, and the lower mold has a cast member that moves in and out as the upper mold moves up and down. A cam member is provided, and the casting member is linked with an arm that can come into contact with the cam member of the lower mold, and the arm is configured to maintain the retreating posture of the casting member after casting. A casting device for casting, characterized by being provided with a weight.