JP2002346723A - Die casting machine using pin for hole as cast and method for taking out pin for hole as cast - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delivery pipe for distributing and supplying fuel through an injector to an intake manifold, etc., by using a die casting machine and casting molten aluminum into a cavity part. SOLUTION: A pin for hole as cast is arranged so as to be freely inserted/ taken out at the interval of positioning parts disposed between an upper metallic mold and a lower metallic mold in a cavity part formed with both metallic molds. The pin for hole as cast is constituted of a first pin for hole as cast corresponding to a through-hole at the center part and a second pin for hole as cast disposed so as to be dividable at the outer circumference thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting pin for producing a delivery pipe for distributing and supplying fuel to an intake manifold or the like through an injector by casting a molten aluminum in a cavity portion by using a die casting machine. The present invention relates to a die-casting machine and a method for blanking a blanking pin.

[0002]

2. Description of the Related Art In an injection molding machine such as a die casting machine, a molten metal is filled from a casting device through a biscuit portion and a runner portion of a mold device into a cavity portion, where it solidifies and forms a product as shown in FIG. 142. When the product 142 is a delivery pipe for distributing and supplying fuel to an intake manifold or the like shown in FIG. 8 via an injector, the hydraulic cylinder 15
In order that the draft angle can be sufficiently maintained through the rod 146 through the rod 146, the tip end portion has a fine drawing shape.
Connected to 0.

Prior to casting and filling a molten metal into a cavity of a mold, as shown in FIG. 8A, a casting pin 140 is placed between an upper portion of one mold and a lower portion of the other mold. After the filling of the molten metal is completed, cooling water is passed through the mold apparatus to cool the molten metal. Next, hydraulic oil is introduced into the hydraulic cylinder 150 to move the cast pin 140 upward to release the engagement with the product 142. Thereafter, both molds are opened, and the product 142 remaining on the movable mold side is taken out by a product take-out device (not shown), and an inner through-hole 145 (a) tapered in the axial direction (FIG. 8 (b)), a boring machine was used to change the shape into a straight through hole 145 (b) (FIG. 8 (c)).

[0004]

However, the through-hole 145 (a) in the inside of the delivery pipe formed by such a casting method has a taper in the axial center direction, and has a straight cross section. In order to provide the through-hole 145 (b), it is necessary to machine the through-hole 145 (a) for each product, so that the number of product processing steps is increased by the processing time and the production rate is reduced. There was a problem of doing.

[0005]

According to a first aspect of the present invention, there is provided a stationary die held by a fixed plate, and a movable plate movable in a direction of approaching and separating from the fixed plate. A movable mold held in the mold, and a cavity formed between the two molds is provided so as to be able to insert and remove a casting pin between a positioning part provided at the upper part of the mold and a lower part of the mold. A die casting machine, wherein the cast pin is on an extension of a rod of a hydraulic cylinder disposed on an upper side of the mold,
A first die-cast pin having a symmetrical tapered surface extending from the large-diameter part on the rod side to a small-diameter part at the lower end, and a convex part provided in the middle of the tapered surface, on both sides of the first die-cast pin In addition, the inner peripheral portion is provided with a taper having the same inclination as the taper, and the second molded pin has a concave portion which engages with the convex portion and limits a relative movement amount with respect to the first molded pin. Further, in the second invention, a first cast pin located in a central region and a second cast pin located in an outer peripheral portion thereof are combined with a cavity formed between a fixed mold and a movable mold. After mounting, the cavity is filled with molten metal, and after cooling the molten metal, the first molding pin is moved upward by a driving means connected to the first molding pin, and the first molding die is moved halfway. The second blanking pin locked to the pin projection is moved upward together with the first blanking pin to remove the blanking pin from the product part.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a die casting machine using a cast pin and a method of casting a cast pin according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall longitudinal sectional view showing the present invention, FIG. 2 is a perspective view of a cast pin, FIG. 3 is a sectional view of a main part when the cast pin is set in a mold, and FIG. 4 is a cast pin. FIG. 5 is an operation diagram showing a state in which a pressing force is applied at a relative position between the first molding pin and the second molding pin, FIG. 6 is an explanatory diagram for explaining FIG. 5, FIG. 7 shows a schematic view of a delivery pipe as a product.

This die casting machine mainly comprises a mold apparatus 10 and a casting apparatus 12. The mold apparatus 10 includes a fixed mold 16 held on a fixed board 14 and a movable mold 20 held on a movable board 18. A column 24 is connected to the fixed plate 14 via a nut 22. The movable plate 18 can be freely moved in a direction approaching and separating from the fixed plate 14 along the column 24 by a toggle mechanism (not shown). Have been.

A cavity 26, a runner 28, and a biscuit 30 are provided on the mating surface of the fixed mold 16 and the movable mold 20.
Is provided. The mold apparatus 10 is installed on a machine base 44, and the machine base 44 is installed so as to straddle a pit 48 formed in the ground base 46.

The casting apparatus 12 is installed in the pit 48. The pouring device 12 has a configuration in which an injection cylinder 50, a block 52, and a sleeve 54 are sequentially installed from the lower stage side. The injection cylinder 50 is supported by a receiving seat 56 fixed to the bottom surface of the pit 48 via a pin 58, and the upper end can be tilted about the pin 58 as a rotation center. A piston 60 is provided in the injection cylinder 50 and has a rod 6 extending upward.
2 are connected.

The block 52 is provided with a cylinder hole 64 extending vertically, and a docking ram 66 is inserted into the cylinder hole 64.
Is fixed to a flange 68 formed on the upper surface of the injection cylinder 50. The sleeve 54 is connected to the upper side of the block 52 via a connecting member 69, and the upper end thereof can be inserted into the lower end of the biscuit part 30 of the mold apparatus 10.

A plunger tip 7 is provided in the sleeve 54.
0 is slidably installed, and the plunger tip 7
The lower end of the plunger 72 holding 0 is connected to the upper end of the rod 62 via a coupling 73. A tilt cylinder 74 is pivotally supported on the side wall of the pit 48 via a seat 76 and a pin 78 so that the rod 82 is connected to a piston 80 of the tilt cylinder. And a pin 86 pivotally attached to the side surface of the flange 68 of the injection cylinder 50.

Next, the structure of the cast pin will be described.
First, the cast-out pin 90 surrounds the first cast-out pin 92 located in the central region and the first cast-out pin 92 and is configured to be symmetrically splittable with respect to the first cast-out pin 92. The second cast pins 94 (a, b) are formed. The first cast pin 92 and the second cast pin 9
4 (a, b) is formed to have the same diameter as that of the rod 98 by forming a configuration in which the outer shell is formed in a straight body with a circular diameter over both ends of the cast pin 90 into which the rods 98 are combined.

The other upper end of the first cast pin 92 is connected to a rod 98 of a hydraulic cylinder 96, and a flange 102 is formed as the cast pin 90 combined with the second cast pin 94 (a, b). Guide pipe 10 fixed to
0 and can be slid up and down while being guided by the guide pipe 100. Rod 98
The diameter of the upper end portion of the first cast pin 92 on the side connected to the taper is symmetrically cut in a left-right symmetrical manner from the enlarged diameter portion at the upper end to the small diameter at the lower end. Protrusions 104 (a, b) are formed symmetrically in the middle of the tapered surface portion of the cast pin 92.

On the other hand, the second blanking pins 94 (a, b) which are formed in half and can surround the first blanking pins 92.
Of the first cast pin 92 is
A recess 106 (a, b) having a fixed length is formed along the axial direction of the second cast pin 94 so that the recess 106 (a, b) can be relatively slid while being in contact with (a, b). I have. The outer peripheral surface of the convex portion 104 (a, b) is
It has a tapered shape having substantially the same angle in the same direction as the above.

On the other hand, the concave portions 106 (a, b) which come into contact with the outer peripheral surface of the convex portions 104 (a, b) also have the convex portions 104 (a, b).
The tapered structure has the same inclination as that of (a, b). That is, at the position where the first cast pin 92 is pulled up and the convex portion 104 (a, b) moves to and contacts the upper end of the concave portion 106 (a, b), the wedge effect is lost, and The first cast pin 92 is connected to the second cast pin 94.
(A, b) is released from the fitted state (FIG. 4). Conversely, the first cast pin 92 is pushed down and the convex portion 104 (a, b) moves to the lower end of the concave portion 106 (a, b), and the first cast pin 92 and the second cast pin 94
When the leading ends of (a, b) are flush with each other, they are locked by the concave positioning portion 110, so that the first cast pin 92 and the second cast pin 94 (a, b) are wedge-shaped. The fitting state is maintained by the effect. As described above, the convex portion 104 (a, b) is
While the guide is held at b), it can be moved up and down freely between the strokes S (FIG. 4).

Further, as shown in FIG. 1, the short tubular guide pipe 100 is screwed into a screw portion provided at the center opening of the flange 102 so that it can be attached or detached.
The flange 102 is fixed to the upper part of the fixed mold 16 in an inclined state by bolts or the like. Casting pin 90
Is inserted into the guide pipe 100 and then abuts against a concave positioning portion 110 disposed below the movable mold 20 to hold the casting pin 90 in an inclined state. . The guide pipe 100 is connected to the flange 1
02 or the second cast pin 94
(A, b) and the first cast pin 92 can also be removed. The exchange of the first cast pin 92 and the second cast pin 94 (a, b) is performed especially in the oil passage 11.
6 is effective when the diameter of the through hole 118 of the product 108 is different.

Four supporting legs 112 are erected at equal intervals at a position slightly inside the outer line of the flange 102, and a flange 114 is provided at the upper end of the supporting leg 112. The hydraulic cylinder 96 is attached to the flange 114.
The rod 98 of the hydraulic cylinder 96 extends downward after passing through an opening hole opened at the center of the flange 114, and has a first end at the lower end of the rod 98.
The cast pin 92 is screwed so as to be coaxial.

Next, the operation of the die casting machine using the thus-formed cast pin will be described.

First, the convex portion 104 of the first cast pin 92
(A) and 104 (b) are replaced with the concave portions 10 of the second cast pin 94.
With the combination of 6 (a) and 106 (b), the hydraulic oil is introduced into the hydraulic cylinder 96 while the rods 98 are pulled up to the uppermost position. Next, the movable mold 20 is gradually approached to the fixed mold 14, and the fixed mold 14 is brought into contact with the movable mold 20, and then the mold is clamped.

Subsequently, when pressure oil is introduced into the hydraulic cylinder 96 to gradually lower the rod 98 downward, the convex portions 104 (a, b) of the first cast pin 92 are brought into contact with the second cast pin 94.
In a state where the first die pin 92 and the second die pin 94 (a, b) are lowered together with the concave part 106 (a, b) of (a, b), the lower part of the movable mold 20 is lowered. In contact with the positioning portion 110 disposed in the first position. At this time, the convex portion 104 (a, b) of the first cast pin 92 and the second cast pin 94
The fitted state is maintained in the concave portion 106 (a, b) provided in (a, b). This state is shown in FIG.

By lowering the rod 98 to the lowermost end, the protrusions 104 (a, b) of the first cast pin 92 are moved to the recesses 106 (a, b) of the second cast pin 94 (a, b).
And the same pressing force F1 acts on both the tapered surfaces of the first cast pin 92 and the respective tapered surfaces of the second cast pin 94 (a, b). Acting outward, a wedge effect occurs (FIG. 5 (a)).

As described above, since the mold clamping has been completed after both the fixed mold 16 and the movable mold 20 have been matched, the operation of the casting apparatus 12 is continued in parallel with these series of operations. Is performed. That is, by releasing the hydraulic oil supplied into the cylinder hole 64, the block 52 is released.
Is lowered and is seated on the cylinder 50. Further, by releasing the hydraulic oil supplied to the head end side of the injection cylinder 50, the piston 60 is lowered to the lower limit, and the plunger tip 70 is also lowered to the lower limit. When the rod 82 of the tilt cylinder 74 is protruded in this state, the casting device 12 tilts as a whole. Then, molten aluminum is poured into the sleeve 54.

Thereafter, the rod 82 of the tilt cylinder 74 is
Is retracted, and the casting device 12 is set to the vertical posture. Next, hydraulic oil is introduced into the cylinder hole 64 of the block 52, and the docking ram 66 is made to protrude. This causes block 5
2 rises, and the sleeve 54 is inserted into the biscuit portion 30 of the mold apparatus 10. Therefore, hydraulic oil is introduced into the chamber on the head end side of the injection cylinder 50, and the piston 60 is pushed up. As a result, the plunger tip 70 rises, and the molten aluminum stored in the sleeve 54 is introduced into the cavity 26 via the biscuit part 30 and the runner part 28.

After the solidification of the molten metal in the cavity 26 is completed, when hydraulic oil is introduced into the hydraulic cylinder 96 and the rod 98 is pulled up, the fitting state in which the distal end portion is in contact with the positioning portion 110 (FIG. 5) (A)) from the first cast pin 92
Rises, the state of engagement between the first cast pin 92 and the second cast pin 94 is released. As described above, under the fitted state, the convex portions 104 (a, b) are
The pressing force F1 acts outward while being in contact with the lower end of (a, b), and the same applies to both the tapered surface portions of the first and second cast pins 92 and 94 (a, b). The strong wedge force is acting.

Next, the first cast pin 92 is continuously pulled up so that the convex portion 104 (a, b) is located at an intermediate point of the concave portion 106 (a, b) having the length of the stroke S. a, b) outer peripheral portion and concave portion 106 (a, b)
The pressing force F2, which is smaller than the pressing force F1, acts outward due to a slight gap between the inner peripheral portions of the first and second pins, and the taper of both the first cast pin 92 and the second cast pin 94 (a, b). A wedge force smaller than the pressing force F1 acts on the surface portion (FIG. 5B).

Subsequently, the first cast pin 92 is lifted up so that the convex portion 104 (a, b) is located at the uppermost end of the concave portion 106 (a, b) having the length of the stroke S. A gap is further increased between the outer peripheral portion of a, b) and the inner peripheral portion of the concave portion 106 (a, b).
3 acts outward, and the wedge force hardly acts on both the tapered surface portions of the first cast pin 92 and the second cast pin 94 (a, b).
(A, b) is not restricted by the first cast pin 92, so that the degree of freedom between them is high, and as shown in FIG. 4, the through hole 118 and the second cast pin 94 (a, b) ), A gap of α is generated (FIG. 5C).

The recess 1 having the length of the stroke S
FIG. 6 shows the relationship between the moving distance of the first cast pin 92 and the pressing force at 06 (a, b). In FIG. 6, as the moving distance of the first cast pin 92 gradually increases, the pressing force is the largest (the wedge force is the largest) F1.
, F1> F2 from the pressing force F3 at which the wedge force is released
> F3, it monotonically decreases gradually. And
The pressing force F3 when moving to the stroke S is almost zero or close to zero.

Next, when the product 108 is taken out, the movable plate 18 is first retracted to open the mold, and the product 10 is opened by a product extruder (not shown) provided in the movable mold 20.
Extrude 8. Prior to this mold opening, the piston 60, the block 52, etc. have been lowered to the lower limit.
It is in a standby state for the next image passing operation. In addition, since the taken out product 108 does not have the oil passage 116 as shown in FIG. 7 and is solid, a hole of an appropriate size is formed in a product processing section in the next process.

In this embodiment, the delivery pipe is cast using aluminum as the casting metal of the product 108. However, the present invention is not limited to this. For example, when the delivery pipe is injection-molded using magnesium, resin, or the like. Also, the principle of the cast pin 90 can be used. Further, the product 108 is not limited to the delivery pipe, but can be applied to a case where a product 108 that requires a hollow portion having a straight cylindrical inner diameter is required.

[0031]

As described above, by using the cast pin as in the present invention, it is not necessary to machine the through hole after the mold is removed from the mold, and the number of machining steps can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing the present invention.

FIG. 2 is a perspective view of a cast pin.

FIG. 3 is a sectional view of a main part when a cast pin is set in a mold.

FIG. 4 is a state diagram when the wedge effect of the cast pin is released.

FIG. 5 is an operation diagram showing a state in which a pressing force is applied at a relative position between a first cast pin and a second cast pin.

FIG. 6 is an explanatory diagram for explaining FIG. 5;

FIG. 7 is a schematic view of a delivery pipe as a product.

FIG. 8 is an explanatory view showing a production process of a conventional delivery pipe.

DESCRIPTION OF SYMBOLS 10 Mold device 12 Casting device 14 Fixed plate 16 Fixed die 18 Movable plate 20 Movable die 26 Cavity portion 28 Runner portion 30 Biscuit portion 44 Machine base 50 Injection cylinder 52 Block 54 Sleeve 60 Piston 62 Rod 64 Cylinder hole 66 Docking ram 69 Connecting member 70 Plunger tip 72 Plunger 74 Tilting cylinder 84 Joint 90 Casting pin 92 First casting pin 94 (a, b) Second casting pin 96 Hydraulic cylinder 100 Guide pipe 104 (a, b) convex part 106 (a, b) concave part 108 product 110 positioning part 112 support leg 116 oil passage 118 through hole 140 cast pin 142 product 145 (a) tapered through hole 145 (b) straight through hole 150 Hydraulic cylinder

Claims (2)

[Claims] 1. A fixed mold held by a fixed board and a movable mold held by a movable board movable in a direction of coming and going with respect to the fixed board, wherein a cavity formed between the two molds is provided. What is claimed is: 1. A die-casting machine provided so as to be able to insert and remove a molding pin between an upper portion of the mold and a positioning portion arranged at a lower portion of the mold, wherein the molding pin is arranged on an upper side of the mold. On the extension of the rod of the hydraulic cylinder, the first cast pin having a left-right symmetric tapered surface extending from the large-diameter portion on the rod side to the small-diameter portion at the lower end and having a convex portion provided in the middle of the tapered surface. A recess formed on both sides of the first cast pin and having an inner peripheral portion provided with a taper having the same inclination as the taper and engaging with the convex portion to limit a relative movement amount with respect to the first cast pin. And a second die casting pin. Die casting machine using structure. 2. A combination of a first cast pin located in a central region and a second cast pin located in an outer peripheral portion thereof is mounted on a cavity formed between a fixed mold and a movable mold. The cavity is filled with molten metal, and after cooling the molten metal, the first molding pin is moved upward by a driving means connected to the first molding pin, and the convex part of the first molding pin is moved halfway. Wherein said second cast pin, which is locked to said first pin, is moved upward together with said first cast pin to remove said cast pin from a product part.