JPH1015643A - Molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding machine which can easily mold a core for a mold for V type multi-cylinder internal combustion engine having cylinder parts having different widening angles. SOLUTION: The molding machine is provided with a metallic mold body 7 composed of an upper and a lower molds 3, 4, a pair of bore-mandrels 10a, 10b for forming cylinder part inserted so as to be freely inserted/removed into/ from a hole part 8 in the metallic mold body 7 and a skirt mandrel 9 inserted so as to be freely inserted/removed into/from the hole part 8 in the metallic mold body 7. A hollow part for blowing molding sand into the hole part 8 in the metallic mold 7 is formed with the bore mandrels 10a, 10b for forming the cylinder part and the skirt mandrel 9. The angle θ formed between a pair if bore mandrels 10a, 10b can be changed with an angle adjusting means M.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine for molding a mold core for a V-type multi-cylinder internal combustion engine.

[0002]

2. Description of the Related Art A core of a mold for a V-type multi-cylinder internal combustion engine has a pair of cylindrical portions which are expanded in a V-shape. As a molding machine for molding the core, a mold comprising upper and lower dies is used. A mold apparatus including a main body and a pair of bore-mandrels for forming a cylindrical portion which are removably inserted into holes of the mold main body and expanded at a predetermined angle is used. That is, a hollow portion is formed in the hole of the mold body by the bore forming mandrel, and sand is blown into the hollow portion. By the way, as a core,
There are a plurality of types in which the opening angles of the cylindrical portions are different, and it has been necessary to mold a plurality of cores.

[0003]

However, conventionally,
In the mold apparatus of this type of molding machine, the opening angle of the bore mandrel for forming the cylindrical portion was constant and could not be changed. Therefore, in order to mold a core having a different opening angle of the cylindrical portion, it is necessary to change the entire mold apparatus. Therefore, an object of the present invention is to provide a core molding machine that can easily mold cores having different opening angles of the cylindrical portions.

[0004]

In order to achieve the above object, a core molding machine according to the present invention comprises a mold for a V-type multi-cylinder internal combustion engine having a pair of cylindrical portions expanded in a V-shape. In a core molding machine, a pair of bore mandrels for forming a cylindrical portion, which are removably inserted into a mold main body composed of upper and lower dies and are opened at a predetermined angle, and are detachable from the mold main body. And a skirt mandrel inserted into the mold body, a hollow portion into which sand is blown is formed in the hole of the mold main body, and an angle adjusting means for enabling a change in an opening angle of the pair of bore mandrels is provided. Things.

At this time, a bore mandrel cylinder for reciprocating the bore forming mandrel along the axial direction thereof is provided, and the angle adjusting means comprises:
A block body that holds the bore mandrel cylinder so as to be able to swing in a horizontal plane, and a block body cylinder that reciprocates the block body in the horizontal plane in a direction substantially orthogonal to the axial direction of the bore mandrel, A first stopper for restricting the forward movement of the block body and fixing the opening angle of the bore mandrel; and a second stopper for restricting the backward movement of the block body and fixing the opening angle of the bore mandrel. Is also preferred.

[0006]

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

FIG. 1 shows a molding machine according to the present invention. This molding machine includes a core 2 (see FIGS. 8 and 9) having a pair of cylindrical portions 1a and 1b which are expanded in a substantially V shape. A mold device 5 having upper and lower dies 3 and 4 for molding;
And a sand supply device 6 for supplying sand to the sand. In this case, the core 2 is a mold core for a V-type multi-cylinder internal combustion engine. The mold device 5 includes a mold body 7 including upper and lower molds 3 and 4 and a hole 8 of the mold body 7 (see FIGS. 3 and 4 and the like).
A pair of cylindrical mandrel forming bore mandrels 10a and 10b (see FIGS. 3 and 4) that are removably inserted into the inside, and a skirt that is removably inserted into the hole 8 of the mold body 7. A mandrel 9.

The mold body 7 is mounted on a holding frame 11 as shown in FIGS. 1 and 2, and the holding frame 11 is mounted on moving rollers 12. The mold body 7 can be moved by driving the rollers 12. That is,
The moving rollers 12 are attached to holding pieces 15, 15 erected on a lower frame body 14 of a base frame 13, and a table 17 that moves up and down by a cylinder 16 is provided between the holding pieces 15, 15. The mold body 7 is lifted up by the raising of the table 17 and lifts up from the moving rollers 12..., And the mold body 7 is lowered by the lowering of the table 17 and is mounted on the moving rollers 12.

As shown in FIG. 3 and the like, the lower mold 4 of the mold body 7 is formed of a rectangular body having notches 20a and 20b formed at two corners, and one side surface is formed on the upper surface thereof. A concave portion 21 that is open to the
A concave portion 22 that opens to a, and a concave portion 23 that is connected to the concave portion 21 and that opens to the cutout portion 20b are formed. The upper mold 3 of the mold main body 7 is obtained by substantially turning the lower mold 4 upside down. When the upper and lower molds 3 and 4 are overlapped, the hole 8 is formed. Therefore, the hole 8 includes a main body 8a and a pair of sub-portions 8b.

The main body 8a of the hole 8 of the mold main body 7
The above-mentioned skirt mandrel 9 is removably inserted into the
The bore forming mandrels 10a and 10b for forming the cylindrical portion are removably inserted into the sub-portions 8b and 8b of the hole 8 of the mold body 7, respectively. That is, as shown in FIG.
A holding frame 25 is attached to the
The piston 26b of the cylinder 26 is connected to the skirt mandrel 9, and the skirt mandrel 9 is removably inserted into the body 8a of the hole 8 by the reciprocating motion of the piston rod 26b of the cylinder 26. Is done. The skirt mandrel 9 is connected to a pair of guide rods 27, 27 which are slidably inserted into the holding frame 25, and guide the pair of guide rods 27, 27 when the skirt mandrel 9 reciprocates. And the reciprocation is stabilized. 26a indicates a cylinder tube.

Further, a bore mandrel 10a for forming a cylindrical portion is provided.
10b, the expansion angle θ can be adjusted by angle adjusting means M, M, respectively. The angle adjusting means M is, as shown in FIGS. 3 to 7, a block body for holding a main body 29a of a bore mandrel cylinder 29 (a cylinder for reciprocating the bore mandrel 10a or 10b along its axis).
30 and the block body 30 with the bore mandrel 10a (10b).
And a block cylinder 32 for reciprocating in a direction substantially perpendicular to the axial direction of the block body. As shown in FIG. 5, the block body 30 can swing in a horizontal plane via shafts 33, 33. In this case, the shafts 33, 33 are provided on the upper and lower surfaces of the block body 30, 34 ... is attached to this slide
A pair of guide rods 35 are respectively inserted through 34.
The block body 30 swings in a horizontal plane with respect to the upper and lower slide bodies 34.

In this case, a pair of mounting frames 37, 38 are connected to the other vertical frame 36 of the base frame 13, and each of the mounting frames 37, 38 has
An angle adjusting means M is formed. As shown in FIG. 6, each of the mounting frames 37 and 38 comprises a pair of upper and lower brackets 39 and 40, and the brackets 39 and 40 are connected by connecting pieces 41,
Further, holding pieces 42 and 43 are attached to the brackets 39 and 40, respectively. That is, the holding piece 42 has a horizontal portion 42a and a vertical portion 42b.
The holding piece 43 includes a horizontal portion 43a and a vertical portion 43.
The guide rod 35 is held by the vertical portions 42b and 43b of the holding pieces 42 and 43 and the connecting piece 41. And
The cylinder 32 for the block body has a
The piston rod 32b is pivotally supported by the horizontal portions 42a, 43a of the second and the third 43, and the piston rod 32b is connected to the block body 30 via the mounting body 44.

On the inner surface of the connecting piece 41, a first stopper 45 made of a flat plate is attached, and the vertical portions of the holding pieces 42 and 43 are provided.
On the inner surfaces of 42b and 43b, second stoppers 46 and 46 made of a square body are provided.
Is attached. In this case, the inner surface of the first stopper 45 is an inclined surface 45a as shown in FIG.

Therefore, if the piston rod 32b of the block body cylinder 32 extends, the block body 30, and consequently, the bore mandrel cylinder 29 and the bore mandrel 10a
(10b) moves along the guide rod 35 in the direction of arrow A in a direction substantially perpendicular to the axial direction of the bore mandrel 10a (10b), and the block body 30 is inclined by the inclined surface 45a of the first stopper 45.
4, the axial directions of the bore mandrel cylinder 29 and the bore mandrel 10a (10b) are inclined along the inclination angle of the inclined surface 45a. That is, since the block body 30 can swing on the shafts 33 and 33 in a horizontal plane, the block body 30 is inclined along the inclined surface 45a, whereby the bore mandrel cylinder 29 and the bore mandrel are formed. The axis of 10a (10b) is inclined. Conversely, if the piston rod 32b of the block body cylinder 32 is retracted, the bore mandrel cylinder
29 and the bore mandrel 10a (10b) move along the guide rod 35 in the direction of arrow B (see FIG. 6, etc.) in a direction substantially perpendicular to the axial direction of the bore mandrel 10a (10b),
When the block body 30 comes into contact with the second stopper 46, as shown in FIG. 3, the axial directions of the bore mandrel cylinder 29 and the bore mandrel 10a (10b) are perpendicular to the guide rods 35.

That is, in a state where the piston rod 32b of the block cylinder 32 of each of the angle adjusting means M, M is retracted, as shown in FIG. 3, the axial direction of the bore mandrel 10a and the axial direction of the bore mandrel 10b. FIG. 4 shows a state in which the angle θ formed by the axis of the bore mandrel 10a and the axis of the bore mandrel 10b is 90 °, and the piston rod 32b of the block body cylinder 32 is extended. Thus, the angle θ formed between the axial direction of the bore mandrel 10a and the axial direction of the bore mandrel 10b is
80 °.

By the way, the piston rod of each cylinder 29
When 29b is extended, the bore mandrels 10a, 10b are inserted into the sub-portions 8b, 8b of the hole 8 of the mold body 7, and
When the piston rod 29b of 29 is retracted, the bore mandrels 10a and 10b are withdrawn from the sub-portions 8b and 8b of the hole 8 of the mold body 7. Further, guide rods 56 are held by the boss portion 55 holding the bore mandrels 10a, 10b, and the guide rods 56, 56 are inserted into the block body 30. Therefore, when the bore mandrels 10a, 10b reciprocate, the guide rods 56, 56 cause the bore mandrel 10a, 10b to move.
a and 10b are guided.

An upper plate 48 of the base frame 13 has a hopper 49 and a sand supply gate 6 for supplying core sand to the blow head 51, and a bogie 50a attached to the lower side is provided with a trolley 50a. A carriage 50 with a head 51 suspended and further traversable.
b. A gassing device 52 suspended from b. The blow head 51 reciprocates between the sand supply position and the upper part of the mold body 7, that is, the molding position.
Is configured to reciprocate between the molding position and the retreat position instead of the blow head 51. At the molding position of the upper plate 48, a pressure bonding device for pressing the blow head 51 and the gassing device 52 against the upper surface of the mold body 7 is arranged (not shown).

Next, a method of molding the core 2 using the molding machine configured as described above will be described. First, the cylinder 1
The case where the expansion angle θ ₁ (see FIG. 8) of a and 1b is 90 ° will be described.

In this case, when the piston rod 32b of the cylinder 32 for the block body of each angle adjusting means M, M is retracted, the expansion angle θ of the bore mandrels 10a, 10b is set.
90 °. And the mold split surface is Bohr mandrel 10
The table 17 is raised to the level of the centers of a and 10b and the center of the skirt mandrel 9. Thereafter, the piston rods 29b, 29b of the cylinder 29 and the piston rod 26b of the cylinder 26 are extended, and the bore mandrels 10a, 10b are inserted into the sub-portions 8b, 8b of the hole 8 of the mold body 7, as shown in FIG. Then, the skirt mandrel 9 is inserted into the body 8a of the hole 8 of the mold body 7.

Thereafter, the blow head 51, which has been moved to the molding position, is pressed against the upper surface of the mold body 7, and then compressed air is sent into the blow head to remove the sand inside the blow head. And a blow head which retreats to the sand replenishing side after releasing the pressure bonding, into the hollow portion S (formed by the bore mandrels 10a and 10b and the skirt mandrel 9 in the hole 8 of the mold body 7). Instead, the gassing device 52 moves to the molding position and is pressed against the upper surface of the mold body 7. Thereafter, the core 2 is hardened by sending a hardening gas from a gas generator (not shown) to the sand filled in the hollow portion S of the mold body 7 via the gassing device 52 to harden the core. What you get. This curing method is referred to as a cold box molding method. As a means for curing the core 2, a method in which sand is blown into a mold member forming the hollow portion S in advance and filled and baked and cured. (Heat curing molding method) is also available.

Next, the piston rod 29b of the cylinder 29,
29b and the piston rod 26b of the cylinder 26 are withdrawn, and the bore mandrels 10a, 10b and the skirt mandrel 9 are pulled out of the mold body 7, and then the table 17 is lowered to place the mold body 7 on the moving rollers 12. Place.
Thereafter, the moving rollers 12 are driven to be conveyed to the core take-out stage, where the mold body 7 is opened, and the molded core 2 (the widening angle θ ₁ of the cylindrical portions 1a and 1b is increased). Is 90 °
Is removed, the molding of the core 2 is completed.

The expansion angle θ ₁ of the cylindrical portions 1a and 1b is 80
In the case of °, the piston rod 32b of the block body cylinder 32 of each of the angle adjusting means M, M is extended,
The angle θ between the axis of the bore mandrel 10a and the axis of the bore mandrel 10b is 80 °. After that, the cylinder 1
a, if expansion angle theta ₁ of 1b is performed step as in the case of 90 °, it is possible to molding a core second cylindrical portion 1a, widening the angle theta ₁ of 1b is 80 °.

The angle of the angle adjusting means M is not limited to 80 ° or 90 °. In other words, the first stopper 45 and the second stopper 46 for the block body 30 are replaced with those having different angles of the inclined surfaces, and the bore mandrel is replaced.
By changing the angle between the axes of 10a and 10b, the expansion angle can be changed.

[0024]

Since the present invention is configured as described above, the following effects can be obtained.

The core 2 having the cylindrical portions 1a and 1b having different expansion angles θ ₁ can be easily and reliably formed, and the initial cost can be significantly reduced. Not be allowed complicating the entire apparatus, moreover, also allows easy angle switching of the expansion angle theta ₁ core 2 to molding.

[Brief description of the drawings]

FIG. 1 is a front view of a molding machine according to the present invention.

FIG. 2 is a side view.

FIG. 3 is a plan view of a main part.

FIG. 4 is a plan view of a main part.

FIG. 5 is an enlarged front view of a main part.

FIG. 6 is an enlarged sectional view of a main part.

FIG. 7 is an enlarged sectional plan view of a main part.

FIG. 8 is a sectional view of a mold body during molding.

FIG. 9 is a sectional view of a mold body during molding.

[Explanation of symbols]

 1a Tube portion 1b Tube portion 2 Core 3 Upper die 4 Lower die 7 Mold body 8 Hole 9 Skirt mandrel 10a Bore mandrel for forming tube portion 10b Bore mandrel for forming tube portion 29 Cylinder for bore mandrel 30 Block 32 Block Cylinder 45 First stopper 46 Second stopper M Angle adjusting means S Hollow part θ Expanding angle

Claims (2)

[Claims] 1. A pair of cylindrical portions 1a, 1 expanded in a V shape.
In a molding machine for a core 2 of a V-type multi-cylinder internal combustion engine having a b, a pair of upper and lower dies 3 and 4 are removably inserted into a mold body 7 and expanded at a predetermined angle. The hollow portion S into which sand is blown into the hole 8 of the mold body 7 is formed by the bore mandrels 10a and 10b for forming the cylindrical portion and the skirt mandrel 9 which is removably inserted into the mold body 7. A molding machine comprising an angle adjusting means M formed and capable of changing a widening angle θ of the pair of bore mandrels 10a and 10b. 2. A bore mandrel 10a for forming a cylindrical portion.
A bore mandrel cylinder 29 for reciprocating the cylinder 10b along the axial direction thereof;
However, a block 30 for holding the bore mandrel cylinder 29 so as to be able to swing in a horizontal plane, and connecting the block 30 in the horizontal plane to the bore mandrel 10a, 10a.
A block body cylinder 32 which reciprocates in a direction substantially perpendicular to the axis of b, and a first means for restricting the forward movement of the block body 30 and fixing the widening angle θ of the bore mandrels 10a and 10b.
The molding machine according to claim 1, further comprising a stopper (45) and a second stopper (46) for restraining the block body (30) from returning and fixing the opening angle (θ) of the bore mandrels (10a, 10b).