JPS5917469Y2 - casting equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a casting device that can prevent erroneous operations.

Generally, when casting a part with an undercut such as a piston using a placing core, the placing core 2 is formed into two parts, as illustrated in FIG. A mold cavity 7 is formed by placing a side core 4 on the outer periphery of the wedge part 1a of the mold 1, and casting is performed by pouring molten metal into the mold cavity 7 from a nozzle 5a of a lower mold 5. was.

However, in low-pressure casting, for example, the product tends to stick to the lower die 5 and the nozzle 58 when the mold is opened, and if it sticks, it becomes extremely difficult to remove the product from the mold.

Therefore, conventionally, as shown in FIG. When the mold is assembled and the mold is closed, the pin 6 is inserted into the through hole 3 to connect the upper mold 1 and the core 2, and then the product is cast by a conventional method to form a product in the mold cavity 7. I was trying to pull out pin 6 before pushing out pin 8.

According to this method of fixing the upper mold 1 and the placing core 2 with the pin 6, manually operating the pin 6 will lengthen the casting cycle, and if you forget to pull out the pin 6, the mold will be damaged. invite.

Furthermore, if the operation of the pin 6 is automated using a hydraulic cylinder or the like, the mold and device will become complicated and uneconomical.

Furthermore, casting flash, dust, etc. tend to enter the through hole 3, and must be removed each time.

The present invention was made in view of the above circumstances, and its purpose is to provide a casting device that can prevent erroneous operation.
The feature is that in a casting device in which a core is placed between a lower mold and an upper mold to form a mold cavity, an upper mold is arranged so as to be movable up and down with respect to the lower mold, and An extrusion plate is provided above, a hook rod is rotatably supported on the upper mold, the rear end of the hook rod is brought into contact with the extrusion plate, and the hook part of the hook rod is used for the lowering movement of the upper mold or The core is engaged with the core as the extrusion plate moves up, and is removed from the core as the upper mold moves up or the push-out plate moves down.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

In FIG. 2, reference numeral 10 denotes a lower mold which is a fixed mold and is equipped with a nozzle 10a for pouring molten metal.
An extrusion plate 11 is provided above the lower die 10 at a predetermined interval, and a guide rod 12 is provided between the extrusion plate 11 and the lower die 10.

Reference numeral 13 denotes an upper mold which is a movable mold and is disposed between the lower mold 10 and the extrusion plate 11 so as to be movable. Spacer 1
5, and in response to the raising and lowering movement of the movable mold board 14, the upper mold also moves up and down.

The upper die 13 has a through hole 1 for the guide rod 12 on the plate surface.
3a, a hook operation hole 13b and a through hole 1, which will be described later.
3 C are perforated respectively.

Reference numeral 16 denotes an extrusion pin that is vertically provided on the lower surface of the extrusion plate 11.

Reference numeral 17 denotes a dog-shaped hook rod which is rotatably supported on the upper die 13 by a pivot 17C.The hook rod 17 has a hook portion 17a at its tip, and the hook portion 17a has the operation hole 13b. The spring 18 extends to the lower surface side of the upper die 13 through the spring 18, and the other end of the spring 18, which has one end attached to the extrusion plate 11, is attached to the rear end portion 17b.

The hook 17 rotates about a pivot 17C as the upper mold 13 moves up or down.

Reference numeral 19 denotes a centering core for forming a mold cavity 21 together with the side core 20 and the lower mold 10, and the centering core 19 is formed by being divided into two parts, and has a protrusion on its upper edge that engages with the hook portion 17H. 19a is formed.

22 is a stopper provided on the upper surface of the upper mold 13;
This restricts the approach distance between the extrusion plate 11 and the upper die 13.

Reference numeral 23 serves as a guide for the movable mold plate 14 and also serves as a guide for the extrusion plate 1.
This is a rod that supports the upper surface of the extrusion plate 11, and serves as an operating rod when the extrusion plate 11 is raised and lowered.

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

First, the side core 20 and the placing core 19 are placed on the lower mold 10.

Then, when the upper mold 13 is lowered, the hook rod 17 rotates in the direction of the solid line arrow, and the hook portion 17a engages with the protrusion 19a of the placement core 19.

As a result, the core 19 is fixed to the upper die 13.

Then, from the nozzle 10 a of the lower mold 10 to the mold cavity 21
Molten metal is poured into the mold to cast the product 24.

Next, in order to take out the cast product 24, first the side core 20 is removed and the upper mold 13 is raised.

By slightly raising the upper mold 13, the product 24 is extracted from the lower mold 10 together with the placing core 19.

At this time, the hook rod 17 rotates slightly, but the hook part 17
a does not come off from the protrusion 19a.

When the upper mold 13 is further raised, the rear end 17b of the hook rod 17 comes into contact with the lower surface of the extrusion plate 11, and the hook rod 17 is rotated in the direction of the dotted line arrow in the figure.

As a result, the hook portion 17a of the hook rod 17 is disengaged from the protrusion 19a of the core 19.

Then, when the upper mold 13 is further raised, the extrusion pins 16 of the extrusion plate 11 come into contact with the upper surface of the core 19, and the upper mold 13 and the core 1 are brought into contact with each other.
Separate from 9.

Finally, the placing core 19 is taken out from the product 24 to complete the work.

Note that the extrusion plate 11 may be arranged so as to be movable up and down.

In the above embodiment, the extrusion plate 11 is stopped and the hook rod 17 and the ejection pin 16 are operated by raising and lowering the upper mold 13, but the extrusion plate 11 can be raised and lowered relative to the upper mold 13. By doing so, the same effect as in the above embodiment can be achieved.

In this case, the extrusion plate 11 is raised and lowered by the extrusion rod 23, and the guide rod 12 is fixed to the lower die 10 or the extrusion plate 11.

That is, when opening the mold, the side core 20 is removed and the upper mold 1 is opened.
3 is raised to extract the product 24 together with the placing core 19 from the lower mold 10, and then the extrusion plate 11 is lowered.

During this time, the rear end portion 17b of the hook rod is pushed by the extrusion plate 11 and rotates in the direction of the dotted arrow, and the hook portion 17a is removed from the protrusion 19a of the core.

Next, the core 19 is removed from the upper mold 13 by the extrusion pins 16.

Further, when closing the mold, after closing the side core 20 and inserting the core 19, the above 13 is lowered, and when the upper mold contacts the core 19, the extrusion plate 11 is raised.

As a result, the hook rod 17 rotates in the direction of the solid arrow, and the hook portion 17a engages with the protrusion 19a of the core 19.
The upper mold and the core are fixed to each other.

As described above, according to the casting apparatus of the present invention, the upper mold and the placing core are reliably fixed and separated by the lifting and lowering movement of the upper mold with respect to the lower mold. It is possible to prevent erroneous operations such as damage to the mold.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a conventional casting device, and FIG. 2 is a conceptual diagram showing a casting device according to an embodiment of the present invention. 10...Lower mold, 11...Extrusion plate, 13...Upper mold,
16... Push-out pin, 17... Hook rod, 18...
Spring, 19... Placement core, 20... Side core, 21... Mold cavity, 24... Product.

Claims (1)

[Scope of utility model registration request] In a casting device in which a core is arranged between a lower mold and an upper mold to form a mold cavity, an upper mold is arranged so as to be movable up and down with respect to the lower mold, and extrusion is performed above the second mold. Set up a board,
A hook rod is rotatably supported on the upper mold, the rear end of the hook rod is brought into contact with the extrusion plate, and the hook portion of the hook rod is adapted to the downward movement of the upper mold or the upward movement of the extrusion plate. A casting apparatus characterized in that the casting device is adapted to engage with the placing core and detach from the placing core as the upper die moves up or the extrusion plate moves down.