JPH0771718B2 - Method for installing collapsible core insert in mold and carrier for collapsible core insert - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention uses a collapsible core to make a cylinder block of a closed deck type such as aluminum for automobiles, a die casting machine or a squeeze casting. A method for holding a collapsible core and setting it at a predetermined position of a mold when cast-molding with a machine, and a carrier for a collapsible core assembly used at that time Is.

[Conventional technology]

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 collapsible device having a shape as shown in FIG. 2 is used. After the core 1 is pre-assembled in the cavity of the mold, molten metal is pressure-filled into the cavity for casting, and after molding, the collapsible storage 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 keeps its original shape without collapsing, and after the casting is completed, 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 provide this property and performance, the collapsible core is made of, for example, sand as a main component, and an appropriate amount of a binder of a special curable resin is mixed with casting sand 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.
A cast iron insert liner 3 that forms a hook-shaped collar portion 1a that protrudes at several points at the end portion of the mold, a concave portion 2a that is a core holding portion of the mold 2, and a portion where an engine piston (not shown) slides. A structure for preventing the collapsible core 1 from coming off from the mold 2 by sandwiching the collapsible core 1 with the flange portion 4a at one end of the substantially cylindrical collapsible core holder 4 which is held by the outer peripheral surface. I was collecting.

In that case, when the mold clamping mechanism is horizontal, 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 collar portions 1a and 4a facing upward, are installed. If 3 is to be installed at a predetermined location of the mold 2 at a time, after the carrier 3 is conveyed to the vicinity of the installation part of the mold 2 in the vertical posture shown on the fifth surface, the protrusion of the installation part of the mold 2 It must be rotated 90 degrees to fit the inside diameter of the retainer 4 into 2b. However, when it is rotated 90 degrees, if it is rotated too far so that the collar portion 1a side is a little lower than the horizontal state, it rides on the collar portion 4a which is the upper end surface of the collapsible insert core holder 4. Only the collapsible storage core 1 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. Runner 3
The collapsible insert core holder 4, which is integrally incorporated on the outer periphery of the mold, is fitted into the protrusion 2b of the mold 2 and installed.

[Problems to be Solved by the Invention]

If 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.

The present inventor eliminates the work by such an operator,
The following means were invented for the purpose of automating the production and eliminating the risk while improving the productivity.

In that means, when the collapsible core is placed 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 part of the cylinder block. In addition, 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 circumference of the outer holder are used to set the outer holder's flange and the inner holder tip. While holding the brim on the tip side of the collapsible insert core between it and the brim on the side, hold the inner peripheral surface on the rear end side of the inner holder with a carrier to hold the brim side of the inner holder on the mold side. The collapsible insert core is set in the mold by being fitted into the core holding portion.

According to the means, a collapsible core assembly including an inner holder, an outer holder, a collapsible core and an insert liner is moved by holding a front side inner peripheral surface portion of the inner holder by a carrier, and When installed on the specified core holding part of the mold, the collapsible insert core is held between the outer holder and the inner holder brim, so that the collapsible insert core is in a horizontal state and the tip side of the collapsible core is Even when the collapsible core is tilted downward from the horizontal state, the forward direction of the collar portion of the collapsible core is restricted by the inner holder, and the retracted direction is restricted by the outer holder and does not fall.

However, if the front inner side of the inner holder is held by the carrier only by such a means, the front side of the collapsible core assembly will be inclined to the lower side than the horizontal state. The outer holder, collapsible insert core, and insert liner may slide toward the front side, which may impede the transportation of the collapsible insert core assembly or, in some cases, the collapsible insert core. There was a possibility that some of them would be damaged.

[Means for Solving the Problems]

The present invention is to eliminate such drawbacks,
The following means were adopted.

In the present invention, between the flange portion of the cylindrical outer holder with a collar that holds the inner peripheral surface of the insert liner, and the flange portion of the cylindrical inner holder with a collar that is removably provided on the inner periphery of the outer holder, The inner holder, the outer holder, the collapsible core and the insert are held by holding the inner peripheral surface of the inner holder on the rear end side, which does not have the collar, with a carrier while holding a part of the collapsible core. When installing the collapsible core assembly consisting of the liner in the core holding part of the mold, use the flange part provided on the carrier to remove the inner end, outer holder, and insert liner from the rear end side without the flange part. The collapsible transposable core assembly was moved in the overlaid state.

Also, between the flange part of the cylindrical outer holder with a collar that holds the inner peripheral surface of the insert liner and the flange part of the cylindrical inner holder with a flange that is detachably attached to the inner periphery of the outer holder, a collapsible device is installed. A carrier for moving a collapsible placement core assembly that holds a part of a core of a core, the inner holder including a part of the inner holder that holds the inner peripheral surface on the rear end side, the inner holder, the outer holder, and A carrier for a collapsible core assembly having a flange portion covering each end surface of the insert liner on the rear end side without a brim portion was used.

[Work]

In the present invention, between the outer holder holding the insert liner on the tip side of the outer holder and the inner holder on the tip side of the collar, the state of holding the tip side of the collapsible insert core is maintained. The inner peripheral surface on the front side of the inner holder is held by the carrier, and the front end surfaces of the inner holder, outer holder and insert liner are covered by the flange of the carrier, and the inner holder, outer holder, and collapse A collapsible core insert assembly including a core insert and an insert liner is moved by a carrier and installed at a predetermined position of a mold.

At this time, the brim of the collapsible core is tightly held between the brim of the outer holder and the inner holder, and
Since the front side of the insert liner and outer holder is lightly pressed by the flange of the carrier, even if the collapsible core assembly is inclined to either the tip side or the front side, The position of the collapsible core, the insert liner, and the outer holder will not be displaced or dropped, and therefore the collapsible core will not be damaged.

〔Example〕

FIG. 3 shows, as an embodiment for explaining the method of the present invention, a longitudinal section in a state 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 side view 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. Part 5a
Is a substantially cylindrical outer holder having an inner peripheral surface of the insert liner 3 fitted to the outer peripheral surface of the outer holder 5, and the outer peripheral surface of the flange portion 5a of the outer holder 5 and the end surface in the axial direction of the outer holder 5 are collapsible insert cores. It is in contact with the inner surface of the collar portion 1. Up to this point, the conventional structure shown in FIG. 5 is simply turned upside down.

Reference numeral 6 denotes an inner holder having a substantially cylindrical shape, and a collar portion 6a is provided on one outer peripheral portion. A ring-shaped notch 6b having a size capable of receiving the tip of the collar 1a of the collapsible core 1 is provided on the outer peripheral surface of the collar 6a in the axial direction (upper side in FIG. 3).
The inner plane in the axial direction of the collar portion 6a is provided so as to be able to contact the outer plane in the axial direction of the collar portion 5a of the outer holder 5.

When these are installed in a predetermined part of the movable mold 14 as shown in FIG. 1, first, they are placed on a flat surface such as a flat plate in the state shown in FIG. In that case, first, the inner holder 6 is placed with the collar portion 6a facing downward, and the outer holder 5 holding the collapsible placement core 1 and the insert liner 3 is placed while sequentially fitting. Inner holder 6 for carrying a collapsible storage core 1
When placing it on the table, lightly grasp the collapsible core 1 with a grasping tool (not shown) so as not to damage or damage it. As a grip, for example, the inside of the grip is flat,
Use a grip having a variable position, which has a concave-convex portion that expands and contracts like a bellows, and that is gently bent toward the inside by the supply of compressed air. The collar portion 1a of the collapsible storage core 1 has an inner holder 6
It is held in a state of being sandwiched between the collar portion 6a and the collar portion 5a of the outer holder 5, but the lower surface of the collar portion 5a is a collar portion.
It is set so that it is almost not in contact with the upper surface of 1a so that the collar portion 1a is not strongly pressed by the collar portions 5a and 6a and damaged. The insert liner 3 may be fitted after the outer holder 5 is placed. The upper ends of the inner holder 6, the outer holder 5, and the insert liner 3 are substantially flush with each other.

In this state, the upper inner surface of the inner holder 6 is held by the carrier 7, and the inner holder 6 newly provided in the present invention, the outer holder 5 corresponding to the collapsible core holder 4 in the prior art shown in FIG. 6, A collapsible core assembly 21 composed of the collapsible core 1 and the insert liner 3 is carried to a predetermined position of the movable mold 14 and installed.

As the carrier 7, the carrier 7 partially shown in section in FIG.
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 supplies 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. Therefore, when the plug 10 is not inflated, the outer peripheral surface of the plug 10 has a diameter slightly smaller than the inner peripheral surface of the inner holder 5 so that the plug 10 can be easily put in and taken out from the inner holder 5. 12 is a bolt for pressing the tip of the plug 10, 13 is a cap for pressing the end of the plug 10, 13a is a flange portion integrated with the cap, and the flange portion 13a is perpendicular to the axis of the rod portion 9. The size of the flange portion 13a is set so that the inner holder 6, the outer holder 5, and the rear end side of the insert liner 3 without the flange portions 6a, 5a, 3a can be brought into contact with each other. In this way, if the inner peripheral surface of the inner holder 5 is held, not only the collapsible core assembly 21 can be moved, but also the insert liner 3 constituting the cylinder liner of the cylinder block is not damaged.
Of course, the collapsible core 1 has the collar portion 1a lightly held between the inner holder 6 and the collar portions 6a, 5a of the outer holder 5,
Since the flat surface of the flange portion 13a of the carrier 7 is lightly in contact with the end face of the outer holder 5 and the insert liner 3 on the side of the carrier 7, the collapsible core assembly during transportation of the collapsible core assembly 21 is assembled. The outer holder 5 and the insert liner 3 do not move with respect to the inner holder 6 even when the posture of the solid body 21 is inclined, and the position and posture of the collapsible core 1 are rounded or swollen. 1 is not damaged.

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 axial line method of the insert liner 3 or the like becomes horizontal. While moving forward in that position, the inner peripheral surface of the inner holder 6 is fitted to the protrusion 14b at the installation location of the movable mold 14,
The inner holder 6 and the collar portion 6a of the collapsible storage core 1 are provided in the recess 14a.
Install 1a. This state is shown in FIG.

In addition, in FIG. 1, both the inner and outer peripheral surfaces of the flange portion 6a of the inner holder 6 are held by the recessed portion 14a of the movable mold 14, but this is because the flange portion 6a is long in the axial direction. For example, the protrusion 14b may not be provided, and the protrusion 14b may be held on 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 has been installed in the movable die 14 at a predetermined installation position, the supply of compressed air to the carrier 7 is stopped. Pry the plug 10 and move the carrier 7 to a position that does not interfere with work. In addition, 15 is a movable plate.

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

Next, as shown in FIG. 4, the molten metal is poured into the casting sleeve 19.
20 is supplied, and the molten metal 20 in the casting sleeve 19 is injected into the cavity 17 of the molds 14 and 16 by an injection cylinder (not shown) to cast a cylinder block molded product. The mold 14 is opened after a lapse of a predetermined cooling time, and the collapsible insert core is cast together with a molded product by an extrusion device (not shown).
The collapsible core assembly 21, which is composed of 1, 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 the outer holder 5 is removed from the molded product, the collar portion 1a of the collapsible core 1 is broken, but most of the collapsible core 1 remains in the molded product, and the insert liner 3 is It is integrally cast on the inner surface of the molded product.

The collapsible core 1 in the molded product will spontaneously disintegrate and fall apart after some time due to the molten metal at the time of casting and the high heat of the molded product, so it can be easily taken out from inside the molded product. be able to. When a part of the collapsible core 1 remains inside the molded product, the molded product may be vibrated or the remaining collapsible core 1 may be picked up with a stick or the like. If a disintegrating core 1 having a good property is used originally, it is possible to perform efficiently and surely without any extra work.

〔The invention's effect〕

In the present invention, the collapsible core assembly is installed at a predetermined position of the mold by the method described in the claims,
And at that time, since the carrier for moving the collapsible insert core assembly suitable for carrying out the method is used,
When carrying, the collapsible insert core does not come off when the collapsible insert core is in a horizontal position or in any diagonal position, and the flanges of the inner and outer holders and the flange of the transfer part do not come off. No longer falls from the holder. Since the flange portion of the carrier carries the inner holder, the outer holder, and the end surface of the insert liner on the carrier side, the outer holder and insert liner do not come out of the inner holder, and the position and orientation of the collapsible core is maintained. It does not change or the collapsible insert core is damaged. In addition, by clamping the inner peripheral portion of the inner holder with the carrier, the entire collapsible core assembly including the collapsible core, the holder and the insert liner can be assembled without directly touching the collapsible core. It can be installed in the installation position of the mold at one time, and by these things, the production can be automated. In addition, since it is not necessary for an operator to enter the casting machine, safety can be secured.

[Brief description of drawings]

FIGS. 1 and 3 are drawings for explaining one embodiment of the method of the present invention, and FIG. 1 is a longitudinal sectional view showing a state in which a collapsible core assembly is installed in a mold. The figure is a vertical cross-sectional view showing a state before transportation, FIG. 2 is a perspective view showing an example of a collapsible core for cylinder block, and FIG. 4 is a collapsible core assembly installed in a mold. FIG. 5 and FIG. 6 are drawings for showing an example of a conventional method similar to the present invention, and FIG. 5 is a longitudinal sectional view showing a state before transportation. ,
FIG. 6 is a vertical cross-sectional view showing a state of being installed in a mold. 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, 9 ... Rod part, 10 ... Plug, 13a ... Flange part, 14 ... Movable mold , 15 …… Fixed mold, 21 …… Collapsible storage core assembly.

Claims (2)

[Claims] 1. A flange between a cylindrical outer holder with a collar that holds an inner peripheral surface of an insert liner and a flange of a cylindrical inner holder with a collar that is detachably attached to the inner periphery of the outer holder. The inner holder, the outer holder, the collapsible core and the insert are held by holding the inner peripheral surface of the inner holder on the rear end side, which does not have the collar, with a carrier while holding a part of the collapsible core. When installing the collapsible core assembly consisting of the liner in the core holding part of the mold, use the flange part provided on the carrier to remove the inner end, outer holder, and insert liner from the rear end side without the flange part. A method for installing a collapsible insert core in a mold, wherein a collapsible insert core assembly is moved by a covered body. 2. A collar of a cylindrical outer holder with a collar that holds the inner peripheral surface of the insert liner, and a collar of a cylindrical inner holder with a collar that is detachably attached to the inner periphery of the outer holder. A carrier for moving a collapsible core assembly that holds a part of a collapsible core core, wherein the inner holder has a rear end side inner peripheral surface without a collar part, and an inner holder. , A carrier for a collapsible core assembly having a flange portion that covers the outer holder and the end surface of the insert liner on the rear end side without the flange portion.