JP2979822B2 - Mold core removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core extracting device for extracting a core from a casting mold having the core incorporated therein.

[0002]

2. Description of the Related Art Conventionally, as a core pulling device of this kind, an inclined pin is protruded from a mold opposite to a mold in which a core is incorporated, and the inclined pin is inserted into an inclined hole provided in the core. An inclined pin type in which the core is pulled out by using the stroke of the mold opening, and a cam is used in place of the inclined pin, and the core is pulled out by using the stroke of the mold opening. The dog leg cam type, the core is connected to the cylinder device, the cylinder type that pulls out the core by the operation of the cylinder device, the rack gear provided on the core engages with the pinion gear incorporated in the mold In addition, there has been a rack-and-pinion type in which a collar portion protruding from the pinion gear is always engaged with a cam block extending from a counterpart die, and a core is pulled out using a mold opening stroke. (For example, "Daika Door mold of design "light metal communication a company, see issue 1986 October 30, 2008).

[0003] Among the above-mentioned types of core drawing devices, the inclined pin type, the dog leg cam type, and the rack and pinion type all have large inclined pins, cams, cam blocks and the like on the front surface of a mating die. They protrude and hinder the work such as product removal, release agent spraying, and mold cleaning. In addition, since the mold opening stroke is used, there is a restriction that the drawing timing, the drawing order, and the like cannot be freely set. . On the other hand, according to the cylinder method, not only does an obstacle not protrude between a mold incorporating a core (for example, a movable mold) and a counterpart mold (for example, a fixed mold), The core can be pulled out irrespective of the mold opening stroke, and the utility value is high as compared with the above three methods.

[0004]

However, according to the above-mentioned core type core drawing device, the cylinder device is arranged in the same direction as the core withdrawing direction. There is a problem that it protrudes greatly to the side and not only inevitably increases the installation space of the mold, but also deteriorates the changeability of the mold to the casting machine.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to minimize the increase in installation space even if a cylinder system is adopted. An object of the present invention is to provide a core extracting device for a mold.

[0006]

Means for Solving the Problems In order to achieve the above object, according to the present invention, a cylinder device is disposed in a direction intersecting a direction in which a core is pulled out, and the cylinder device is connected to an extension of the core. To a link mechanism consisting of a link having one end pivotally attached to the core and a link having one end pivotally attached to a mold incorporating the core, and further comprising an extension around the extension of the core.
Of the small stroke to supplement the core
An auxiliary cylinder device is provided.

[0007]

In the core pulling-out device configured as described above, since the driving force of the cylinder device is converted into a force in the core pulling-out direction by the link mechanism, the cylinder device intersects the core pulling-out direction. Even if placed in the direction , its drive
The power can be used effectively for core removal. Only
However, a small straw is required at the beginning of drawing, which requires a large pulling force.
The core can be reliably pulled out by operating the auxiliary cylinder device .

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 to FIG. 4 show an embodiment of the present invention . In these figures , reference numeral 1 denotes a fixed mold, 2 denotes a movable mold, and the fixed mold 1 is provided on a fixed die plate (not shown) of the casting machine, and the movable mold 2 is provided with a movable die plate (shown in the drawing) via a die base 3. Abbreviations). The movable die plate is configured to slide on a tie bar (not shown) by driving means. In response to the sliding of the movable die plate, the movable mold 2 is closed and opened with respect to the fixed mold 1. You. Reference numeral 4 denotes a core which is slidably incorporated in the movable mold 2 in a direction orthogonal to the mold opening / closing direction. The core 4 is inserted into and pulled out of the movable mold 2 by the operation of a core extracting device 10 described later. It is supposed to be. In the mold closed state, a cavity 5 is formed by the fixed mold 1, the movable mold 2 and the core 4, and the molten metal is injected into the cavity 5 through the sleeve 6 embedded in the fixed mold 1. An inclined surface 7 is formed on the base side of the core 4, and when the inclined surface 8 of the fixed mold 1 contacts the inclined surface 7 in a mold closed state, the core 4 is prevented from coming off. It has become.

The core drawing device 10 includes a drawing plate 12 for supporting a support rod (core extension) 11 extending from the base end of the core 4. The pulling plate 12 is slidably mounted on four guide rods 14 erected on the side surface of the movable mold 2 and whose upper ends are fixed to each other by a fixing plate 13.
One end of each pair of upper links 15a, 16a and 15b, 16b is rotatably connected to the two opposite side surfaces of the pulling plate 12 using a shaft 17A. One end of lower links 19a, 20a and 19b, 20b arranged corresponding to the upper link is rotatably connected to the bracket 18 using a shaft 17B. The other end of each of the upper and lower links has one of the pairs 15a, 15b, 19a, and 19b, and the other 16a, 16b, 20a, and 20b of the pair has a first and a second.
Are connected rotatably using the connection bars 21 and 22 of the first embodiment. These upper and lower links and connecting bar are linked mechanism 23
When the link mechanism 23 is moved up and down, the extraction plate 12 moves up and down along the guide rod 14, and the core 4 is pulled out or inserted into the movable mold 2.

Thus, the first and second connecting bars 21,
A connection block 24 having a through hole is fixed to both ends of the connection bar 22, and between the connection blocks 24 located at one end and the other end of each of the connection bars 21, 22, the through hole is inserted. Operating rod 2 extended parallel to the mold opening and closing direction
5 and 26 are held respectively. A second connecting bar of the connecting block located on the front side in the mold closing direction;
The connecting block 24 fixed to 22 has two lock nuts 27
a, 27b are used to fix to the operating rods 25, 26, while the connecting block 24, which is fixed to the first connecting bar 21 located on the rear side in the mold closing direction, slides on the operating rods 25, 26. They are freely connected.

A fixed plate 28 is bridge-supported at the rear ends of the operating rods 25 and 26 extending rearward in the mold closing direction. A cylinder device (in this case, a hydraulic cylinder) 29 arranged in a direction crossing the direction is fixed. Cylinder device 29
The output shaft 29 ′ is connected to the first connection bar 21 via the joint member 30, whereby when the output shaft 29 ′ is extended or shortened by the operation of the cylinder device 29, the fixed plate 28 and the The one connecting bar 21 moves relatively to the two connecting bars 21
The interval of 22 is changed, and the link mechanism 23 is moved up and down.

[0013] The above-described part is the
This shows the basic configuration, and the operation of this basic configuration is as follows.
It is as follows.

After the molten metal is injected into the cavity 5 with the mold closed as shown in FIG. 1, the movable mold 2 is opened with respect to the fixed mold 1 after the solidification of the molten metal.
To extend the output shaft 29 '. Then, the first
Is pressed to the left in the figure, and the reaction force causes the cylinder device 29, that is, the fixed plate 28 to move to the right. As a result, the second connecting bar 22 is also pulled to the right via the operating rods 25 and 26, the distance between the two connecting bars 21 and 22 is reduced, and the link mechanism 23 is driven in the upright direction. The pulling plate 12 is moved upward in accordance with the above, and the core 4 is pulled out from the movable mold 2. On the other hand, when the output shaft 29 ′ of the cylinder device 29 is shortened from the pulled-out state, the mutual interval between the two connecting bars 21 and 22 is widened, and the link mechanism 23 is driven in the falling direction. The core 4 moves down, and the core 4 is inserted into the movable mold 2.

In this manner, the driving force of the cylinder device 29 is converted into a force in the core drawing direction by the link mechanism 23, so that even if the cylinder device 29 is arranged in a direction intersecting with the core drawing direction, it is ensured. Since the core 4 can be pulled out and the cylinder device 29 is placed horizontally, the installation space for the mold is reduced. When the mold is mounted on the casting machine, if the cylinder device protrudes greatly to the side of the mold as in the related art, the cylinder device interferes with the tie bar. Although it was necessary to avoid it, when the cylinder device 29 is arranged in a direction intersecting with the core drawing direction as in this embodiment, there is no need to worry about the interference, and the setup changeability is significantly improved. . In particular, in this embodiment, since the link mechanisms 23 are arranged at four symmetrical positions, the center of the pulling force can coincide with the center line of the core 4, and no unnecessary moment is generated at the time of pulling out. Not only can the pull-out of the child 4 be smooth, but also the pull-out force can be minimized.

FIGS. 3 and 4 show the core extracting device 10.
Are shown. This core extraction device 10
Characteristically , a piston portion 31 is provided in the middle of the support rod 11 of the core 4, and an auxiliary cylinder device (hydraulic cylinder) 32 is provided around the support rod 11 so as to be slidable along the piston portion 31. It is in the point.

The core drawing device 10 configured as described above
, The port provided on the lower side of the auxiliary cylinder device 32
When hydraulic oil is supplied into the auxiliary cylinder device 32 through 33A, the auxiliary cylinder device 32 slides along the support rod 11 until it comes into contact with the movable die 2, and is supported after the auxiliary cylinder device 32 comes into contact with the movable die 2. A force acts in a direction to push up the piston portion 31 of the rod 11. Therefore, when the cast product is stuck to the core 4 and a large drawing force is required in the initial stage of drawing, the auxiliary cylinder device 32 is operated in addition to the main cylinder device 29 to cast the core 4. Release from the product is promoted, and the core 4 can be more smoothly pulled out. Since the auxiliary cylinder device 32 needs to be operated only at the time of release, the stroke is very small, and there is not much problem in space.

Here, when the core 4 begins to come off, the auxiliary cylinder device 32 is in contact with the movable mold 2 until the stroke end, but thereafter the auxiliary cylinder device 32 is pressed down most against the support rod 11. Moves with the support rod. When the core 4 is pushed into the movable mold 2, the auxiliary cylinder device 32 comes into contact with the movable mold 2 slightly before the pushing end by switching the oil supply ports 33A and 33B to the tank side. Hydraulic oil escapes from the port 33A of the device 32, the support rod 11 moves relative to the auxiliary cylinder device 32, and the core 4 can be pushed further. When the core 4 is pushed in, the upper port 33B of the auxiliary cylinder device 32
May be supplied with hydraulic pressure, in which case the auxiliary cylinder device
Since the outflow resistance of the hydraulic oil in the pipe 32 can be ignored, the load on the main cylinder device 29 can be reduced.

In the above embodiment , the drawing plate 12
Is slid along the guide rod 14.
This is intended to facilitate movement of the core 4, since usually employs a structure for guiding the core 4 in the movable mold 2 and so as to omit the guide rod 14, a small device
Type conductivity can be achieved.

[0020]

As described above in detail, according to the core extracting device for a mold according to the present invention, the cylinder device is arranged in a direction intersecting with the core extracting direction to pull the core. Since the mold can be pulled out, not only can the installation space for the mold be reduced as much as possible, but also the effect of remarkably improving the setup changeability of the mold is achieved. Also, a large pulling force is required.
In the initial stage of pulling out, make a small stroke auxiliary cylinder device.
By moving the core, the core can be reliably pulled out.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 4 is a schematic diagram showing an arrangement relationship of the auxiliary cylinder device shown in FIG.

[Description of Signs] 1 Fixed type 2 Movable type 4 Core 10 Core extraction device 11 Support rod (core extension) 12 Extraction plate 15A Upper link 15B Upper link 16A Upper link 16B Upper link 19A Lower link 19B Lower link 20A Lower link 20B Lower link 21 Connecting bar 22 Connecting bar 23 Link mechanism 25 Operating rod 26 Operating rod 28 Cylinder device 32 Auxiliary cylinder device

Claims (1)

(57) [Claims] 1. A cylinder device is disposed in a direction intersecting a direction in which a core is pulled out, and the cylinder device is assembled with a link having one end pivotally attached to an extension of the core and the core. A link mechanism comprising a link having one end pivotally attached to a metal mold, and further comprising an extension around the extension of the core.
Of the small stroke to supplement the core
A core drawing device for a mold, comprising an auxiliary cylinder device.