JPH0647151B2 - Method for installing collapsible insert core in mold and collapsible insert core holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses a collapsible core to make a cylinder block of a closed deck type such as an aluminum product for automobiles, a die casting machine or a squeeze casting machine. The present invention relates to a method for holding a collapsible insert core and setting it at a predetermined position in a mold during cast molding, and a collapsible insert core holder used at that time.

[Prior Art] Usually, when a cylinder block is cast from an aluminum alloy or the like using a die casting machine or the like, in order to form a passage such as a water jacket in the cylinder block, for example, a shape as shown in FIG. 2 is used. After the disintegratable core 1 of No. 1 is previously assembled in the cavity of the mold, the melt is pressure-filled into the cavity for casting, and after molding, the disintegratable core 1
The method of ejecting from the molded product is adopted.

Here, the collapsible storage core is usually a core solidified with particles of sand, salt, etc. as the main component, and when it is cast at high pressure by die casting or the like, even if the pressure of the molten metal acts The core installed in the mold cavity does not collapse and keeps its original shape.After the casting, due to the high heat transferred from the molten metal that acts on this core, the bonding force between the core particles is extremely high. Getting smaller,
A core that is formed so that the core will disintegrate into pieces when it is applied naturally or with relatively small force. In order to have this property and performance, the collapsible core is made of, for example, sand as a main component, and the molding sand is mixed with an appropriate amount of a binder of a special curable resin to be molded into a desired shape and cured. The surface of which is coated with an appropriate amount of a special surface coating agent composed of a fireproofing agent or an organic compound is used.

Conventionally, when the collapsible insert core 1 as shown in FIG. 2 is assembled in the mold 2, as shown in FIG.
Attach the hook-shaped brim 1a protruding at several points at the end of the
A substantially cylindrical collapsible core holder 4 having a concave portion 2a which is a core holding portion and a cast iron insert liner 3 which forms a sliding portion of a piston of an engine (not shown) held on the outer peripheral surface. It is sandwiched by the collar portion 4a at one end thereof to prevent the collapsible core 1 from separating from the mold 2.

In that case, when the mold clamping mechanism is a horizontal mold, as shown in FIG. 5 on the horizontal surface, the collapsible insert core 1, the retainer 4, and the insert runner, which are assembled with the flange portions 1a and 4a facing upward, are incorporated. Three
If you try to install the
After being conveyed to the vicinity of the installation portion of the mold 2 in the vertical posture shown in FIG. 5, it must be rotated 90 degrees in order to fit the inner diameter of the holder 4 into the protrusion 2b of the installation portion of the mold 2. I have to. However, when it is rotated 90 degrees, if the collar portion 1a side is rotated too far below the horizontal state, the collar portion 4a, which is the upper end surface of the collapsible insert core holder 4, is rotated.
The collapsible storage core 1 just on top of it falls because there is nothing to prevent.

Therefore, first, the disintegrating core 1 is separately installed in the recess 2a of the mold 2 by a human hand, and the insert is held while being held by hand so that the disintegrating core 1 does not drop from the mold 2. The collapsible insert core holder 4 in which the runner 3 is integrally incorporated on the outer periphery is fitted and installed on the protrusion 2b of the mold 2.

[Problems to be Solved by the Invention] When the collapsible core 1 is installed in the mold 2 and the cylinder block is molded by such a method, there are the following drawbacks.

First, it is dangerous for an operator to enter the machine to install the collapsible core 1 in the mold 2, and at the same time, automated production cannot be performed. In addition, the operator breaks the core 1 in order to grasp the collapsible core 1 or the coating on the surface of the core that prevents the molten metal from being inserted into the core during casting is peeled off. Sometimes. Further, since the collapsible insert core 1 and the insert liner 3 installed in the mold 2 are installed twice, the molding cycle becomes long.

[Means for Solving the Problems] The present invention has the following means for the purpose of automating the production and eliminating the danger and improving the productivity while eliminating the work by the operator. did.

In the present invention, when the collapsible core is installed in the mold when the cylinder block is injection molded by die casting by disposing the collapsible core in the portion corresponding to the position of the water jacket portion of the cylinder block. , A cylindrical outer holder with a collar that holds the inner peripheral surface of the insert liner, and a cylindrical inner holder with a collar that is detachably attached to the inner periphery of the outer holder are used. With some of the collars of the storage core held, the one side of the inner holder is held by a carrier and the collar side of the inner holder is fitted into the core holding section of the mold to disintegrate. The Okiko was installed in the mold.

A holder for holding the collapsible insert core when the cylinder block is injection molded by die casting by disposing the collapsible insert core in a portion corresponding to the position of the water jacket portion of the cylinder block. It consists of a cylindrical outer holder with a collar that holds the inner peripheral surface of the liner, and a cylindrical inner holder with a collar that can be attached to and removed from the inner periphery of the outer holder, and collapses between the outer holder collar and the inner holder collar. A disintegrating insert core holder having a structure capable of holding a part of the brim portion of the insert core was used.

[Operation] In the present invention, a part of the inner holder is held in a state in which the collar of the collapsible insert core is held between the collar of the outer holder holding the insert liner on the outer peripheral surface and the collar of the inner holder. Is held by a carrier and these brim sides are set on a predetermined core holding section of the mold. At this time, since the collar portion of the collapsible insert core is held between the collar portions of the outer holder and the inner holder, the collapsible insert core is in a horizontal state or an inclined state in which the collar portion side is lower than the horizontal state. However, the forward direction of the collar portion of the collapsible insert core is regulated by the inner holder, and the backward direction thereof is regulated by the outer holder, so that the collapsible core never falls.

In addition, the inner peripheral portion of the inner holder is clamped by the carrier so that the collapsible insert core, the retainer and the insert runner are installed at once in the mold installation position without directly touching the collapsible insert core. By these things, automation can be aimed at.

[Embodiment] FIG. 3 illustrates an embodiment of the method of the present invention, in which a collapsible core forming a water jacket portion of a cylinder block of a two-cylinder engine is set up before being installed in a mold. The longitudinal cross-sectional view of a state is shown.

In FIG. 3, reference numeral 1 denotes a collapsible insert core having a collar portion 1a protruding at several points on one end side as shown in FIG. 3, 3 a cylindrical insert runner, and 5 a collar on the outer peripheral portion on one end side. The outer holder 5 is a substantially cylindrical outer holder, and the outer peripheral surface of the outer holder 5 is fitted with the inner peripheral surface of the insert liner 3. The core 1 is in contact with the inner surface of the collar portion. Up to this point, the conventional structure shown in FIG. 5 is simply turned upside down.

Reference numeral 6 is an inner holder having a substantially cylindrical shape, and a flange portion 6a is provided on one outer peripheral portion. On the outer peripheral surface of the collar portion 6a, the collar portion 1a of the collapsible storage core 1 is located on the inner side (upper side in FIG. 3) in the axial direction.
Is provided with a ring-shaped notch 6b that is large enough to accommodate the tip of the outer holder 5, and the inner plane of the collar 6a in the axial direction is the outer holder 5.
It was provided so that it could come into contact with the axially outer surface of the collar portion 5a.

When these are installed in a predetermined part of the movable mold 14 as shown in FIG. 1, first, the third part is placed on a flat surface such as a flat plate.
Place as shown. In that case, first, the inner holder 6
The collar 6a is placed with the collapsible core 1 and the insert liner 3 held in order while being fitted in order. When the collapsible core 1 is carried and placed on the inner holder 6, the collapsible core 1 is lightly gripped by a gripping tool (not shown) so as not to damage or damage the core. As the grip, for example, the grip has a variable-position grip where the inside of the grip is flat and the outside is an uneven part that can be expanded and contracted like a bellows. Use something that gently bends towards you. The brim portion 1a of the collapsible insert core 1 is held between the brim portion 6a of the inner holder 6 and the brim portion 5a of the outer holder 5, but the brim portion 5a.
The lower surface of the collar is almost in contact with the upper surface of the collar portion 1a, and the collar portion 1a has the collar portions 5a and 6a.
Be careful not to damage it by pressing it strongly with a. The insert liner 3 may be fitted after the outer holder 5 is placed.

In this state, the carrying tool 7 holds the inner surface of the upper side of the inner holder 6, and the whole is carried and set to a predetermined position of the movable mold 14.

As the carrier 7, for example, the carrier shown in a partial cross section in FIG. 3 was used. In this case, the carrier 7 has a cylindrical rod portion 9 attached to a bracket portion 8 which is moved by a drive source (not shown), and an outer peripheral surface and a front surface of the rod portion 9 which are made of a flexible material such as rubber. The compressed air supply hole 11 provided inside the rod portion 9 sends compressed air to the inside of the plug 10 to inflate the plug 10 and strongly hold the inner peripheral surface of the inner holder 5. did. 1
2 is a bolt for holding the tip of the plug 10 and 13 is a plug 1
It is a cap for 0 end presser. In this way, if the inner peripheral surface of the inner holder 5 is held, not only can the entire body be moved, but there is no risk of damaging the insert liner 3 that constitutes the cylinder liner of the cylinder block.

The carrier 7 conveys the inner holder 6 or the like to the vicinity of the collapsible core installation of the movable mold 14 and rotates it by 90 degrees so that the insert liner 3 or the like makes the axial direction horizontal. The inner holder 6 is moved forward in that position to fit the inner peripheral surface of the inner holder 6 to the protrusion 14b at the installation location of the movable mold 14, and the inner holder 6 and the collar 6a of the collapsible core 1 are fitted into the recess 14a. , 1a are installed. This state is shown in FIG.

In addition, in FIG. 1, the flange portion 6a of the inner holder 6 is shown.
Both the inner and outer peripheral surfaces of the above are held by the concave portion 14a of the movable mold 14. However, if the flange portion 6a is long in the axial direction, for example, the protrusion portion 14b is not provided,
It is also possible to hold only one of the inner and outer peripheral surfaces.

In this way, when the collapsible core 1 along with the inner holder 6, the outer holder 5, and the insert liner 3 is firmly installed at the predetermined installation position of the movable mold 14, the carrier 7
The supply of compressed air to the device is stopped, the plug 10 is distorted, and the carrier 7 is moved to a position where it does not interfere with the work. In addition, 15 is a movable plate.

Next, the movable mold 14 is moved by a mold clamping device (not shown).
Is brought into contact with the fixed mold 16 to complete the mold clamping as shown in FIG. When the mold clamping is completed, the movable mold 14
The protrusion 16a of the fixed mold 16 at a position facing the protrusion 14b is fitted to the inner peripheral surface of the inner holder 6 so that the inner holder 6 and the like are completely positioned.
Therefore, the insert liner 3 and the collapsible core 1 are naturally positioned sufficiently. In FIG. 4, 17 is a cavity that is a molten metal casting portion, 18 is a fixed platen, 19 is a casting sleeve, and 20 is molten metal.

Next, the molten metal 20 is supplied into the casting sleeve 19, and the molten metal 20 in the casting sleeve 19 is injected into the cavities 17 of the molds 14 and 16 by an injection cylinder (not shown) to form a molded product of the cylinder block. To cast. The mold 14 is opened after a lapse of a predetermined cooling time, and the collapsible core 1, which has been cast together with the molded product by an extrusion device (not shown),
The collapsible insert core holder 4 including the insert liner 3, the inner holder 6 and the outer holder 5 is taken out of the mold 14.

The inner holder 6 and the outer holder 5 are extracted from the molded product taken out of the mold 14 and reused for another molding process thereafter. When removing the outer holder 5 from the molded product,
The collar portion 1a of the collapsible insert core 1 is broken, but most of the collapsible insert core 1 remains in the molded product,
The insert liner 3 is integrally cast on the inner surface of the molded product.

The disintegrating core 1 of the molded product naturally collapses after some time because of the molten metal during casting and the high heat of the molded product.
Since it is separated, it can be easily taken out from the inside of the molded product. In addition, when a part of the collapsible storage core 1 remains inside the molded product, the molded product is vibrated,
You can pick out a different collapsible core 1 by sticking it with a stick, etc., but if you use a collapsible core 1 that has good properties, you need to do this extra work. It can be done efficiently and surely.

[Effects of the Invention] In the present invention, the collapsible core is set at a predetermined position of the mold by the method described in the claims, and
At that time, since the collapsible insert core holder suitable for carrying out the method was used, the inner holder can be carried when the collapsible insert core is in a horizontal or oblique posture during transportation. The disintegrating core is prevented from falling off from the holder as a stopper, and the production can be automated. In addition, safety can be secured because no one enters the casting machine.

[Brief description of drawings]

1 and 3 are drawings for explaining one embodiment of the method of the present invention. FIG. 1 is a longitudinal sectional view showing a state of being installed in a mold, and FIG. 3 shows a state before transportation. Fig. 2 is a longitudinal sectional view, Fig. 2 is a perspective view showing an example of a collapsible core for a cylinder block, and Fig. 4 is a vertical sectional view showing a mold clamping state after the collapsible core is installed in a mold. 5 and 6 are drawings for showing an example of a conventional method similar to the present invention. FIG. 5 is a longitudinal sectional view showing a state before transportation, and FIG. 6 is installed in a mold. It is a longitudinal cross-sectional view showing a state. 1 ... Collapsible insert core, 1a, 4a, 5a, 6a ... Collar part, 2 ... Mold, 2a, 14a ... Recessed part, 2b, 14b, 16a ... Projection part, 3 ... Insert liner, 4 ... collapsible core holder, 5 ... outer holder, 6 ... inner holder, 7 ... carrier, 14 ... movable mold, 15 ... fixed mold.

Claims (2)

[Claims] 1. When a collapsible core is installed in a mold by injection-molding the cylinder block by disposing a collapsible core in a portion corresponding to the position of the water jacket of the cylinder block. , A cylindrical outer holder with a collar that holds the inner peripheral surface of the insert liner, and a cylindrical inner holder with a collar that is detachably attached to the inner periphery of the outer holder are used. With some of the collars of the storage core held, the one side of the inner holder is held by a carrier and the collar side of the inner holder is fitted into the core holding section of the mold to disintegrate. A method for installing a collapsible insert core in a mold, in which the insert core is installed in the mold. 2. A holder for holding a collapsible core when a cylinder block is injection molded by die casting by disposing the collapsible core at a portion corresponding to the position of the water jacket portion of the cylinder block. It consists of a cylindrical outer holder with a collar that holds the inner peripheral surface of the insert liner, and a cylindrical inner holder with a collar that can be installed and removed on the inner periphery of the outer holder.The outer holder's collar and the inner holder's collar A collapsible elastic core retainer having a structure capable of retaining a part of the collar portion of the disintegratable elastic core.