JP3346856B2 - Casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting die such as a die casting, and more particularly to a method for casting a ring-shaped casting having an uneven surface such as a screw on an inner peripheral portion thereof.

[0002]

2. Description of the Related Art As a conventional casting mold of this kind, a structure described in, for example, Japanese Patent Publication No. 61-57107 is known.

In this conventional casting mold, a pair of sliding cores, each of which is provided with a cavity forming projection provided in a casting molding recess of a fixed mold, is brought into contact with and separated from the fixed mold. The movable mold is provided so as to be movable in a direction perpendicular to the moving direction of the movable mold, and a middle piece is arranged between the pair of cores so as to be able to move forward and backward.

[0004] When the cast product is taken out of the mold, the middle piece is removed from between the sliding cores before the movable mold separates from the fixed mold, and then the movable mold is removed from the fixed mold. When moving from the mold in the mold opening direction, the cast molded product extracted from the molded mold recess of the fixed mold is adhered to the cavity forming projection of the sliding core moving integrally with the movable mold, and the movable mold is When moving in the mold opening direction, a pair of sliding cores are moved by a guide part integrally formed from a fixed mold in a direction approaching each other toward a space where the intermediate piece was located, and the sliding cores are moved. , And the cast molded product extracted from the molded product concave portion of the fixed mold is dropped.

In the conventional casting mold, the first pressing plate is moved in the mold opening direction by a hydraulic cylinder, and the first pressing plate is moved to the first pressing plate.
The middle piece fixed to the second pressing plate connected to the pressing plate by the connecting pin is pulled out from between the pair of sliding cores, and in this state, the first pressing plate is further moved in the mold opening direction. Then, the movable mold that has been engaged with the second pressing plate by the connecting pin is moved in the mold opening direction to release the mold.

[0006]

In the casting mold having the above-mentioned conventional structure, the movable mold is separated from the fixed mold after the middle piece disposed between the pair of sliding cores is pulled out at the time of mold release. When moving in the mold opening direction of the movable mold, the pair of sliding cores slides, and the cast product is disengaged from the cavity forming projection of the sliding core and remains in the casting molding recess of the fixed mold. In such a case, there is a problem that it takes time and effort to take out the cast product, and it becomes impossible to continuously cast.

[0007] Further, in order to remove the middle piece from between the pair of sliding cores at the first stroke of the first pressing plate and separate the movable mold from the fixed mold at the next stroke, the first pressing is performed. The stroke of the plate is increased, so that a large space is required for the first pressing plate to move in the casting apparatus, and there is a problem that a casting mold cannot be mounted depending on the type of the casting apparatus.

Further, when the movable mold is separated from the fixed mold, the cast product may not come off even if the sliding core is slid, which is an obstacle to continuous casting.

The present invention has been made in view of the above problems, and it is possible to reliably remove a cast product in a state where a cast product is securely separated from a fixed mold and a movable mold is separated from the fixed mold. An object of the present invention is to provide a casting mold capable of continuously casting a ring-shaped cast product having an uneven surface such as a screw on an inner peripheral portion.

[0010]

SUMMARY OF THE INVENTION A casting mold according to the present invention comprises a stationary mold 1 having a molded concave portion 4 formed therein, and an operating body 8 provided to be able to move forward and backward with respect to the stationary mold 1 . , the fixed mold 1 movable die 2 provided to be retractable toward this operating body 8, movably provided on the movable mold 2 and in a direction perpendicular the direction of movement of the movable die 2 the A pair of sliding cores 16 , 16 , each of which is provided with a split cavity forming projection 19, which is provided in the casting molding recess 4 of the fixed mold 1 and forms a cavity, and which is attached to the operating body 8 and is movable;
The pair of sliding cores 16, 16 are inserted through the insertion holes 23 of the mold 2.
The sliding direction of the slide core 16, 16 and a Chukoma 22 which is movably disposed in the perpendicular direction, inclined in the direction of the tip from the both sides of the actuating body 8 approach each other during the The operating pins 10 , 10 slidably engaged with the inclined engagement holes 21 formed in the pair of sliding cores 16 , respectively from the insertion holes 11 formed in the movable mold 2. And a pair of holding pieces 12 , 12 urged in a direction of holding a locked projection 15 protruding from one of the operating body 8 and the movable mold 2, and rotating the other to the other. A connecting pin 28, which is freely provided and protrudes from the movable mold 2 in the mold opening direction of the movable mold 2 , is provided with a through-hole of
The through strike movement amount in the direction mold opening of the movable die 2
Tsu attached to the first pressing plate 29 is restricted by the path 30, the engagement pin 34 engages with the first pressing plate 29 rotating body 32 which is rotatably supported from the operating member 8 The movable mold 2 is provided so as to project in the mold opening direction, and the first pressing plate 29 and the operating body 8
Between the rotating body 32 and the engaging pin 34
The movable mold 2 is pressed by the rotation of
The connecting pin 28 is attached to the second pressing plate 35 pressed in the opposite direction.
And through holes 36 and 37 through which the engaging pin 34 can be freely moved forward and backward.
And the operating body 8 and the movable metal
Return pin tip to be movably through the fixed mold 1 in the mold 2 is Ru was pressed in contact with returning the first pressing plate 29
38 is provided, the allowed and the actuating body 8 in the second pressing plate 35
It is movably penetrates Dokin type 2 the movable metal to the casting
A pressing pin 40 for peeling off from the mold 2 side is provided.

[0011]

In the casting mold of the present invention, a split cavity forming projection of a pair of sliding cores is disposed in a casting molding recess of a fixed mold, and a middle piece is provided between the pair of sliding cores. A cavity is formed between the molded product concave portion and the cavity forming protrusion in the inserted state. In this state, the molten metal is pressed into the cavity and cast.

Then, when the movable body is moved by a hydraulic device or the like in a mold opening direction in which the movable mold is separated from the fixed mold, the engaged body and the movable mold are moved into a pair of clamping pieces. The movable mold and the intermediate piece move integrally with the operating body. The movement of the movable mold moves the sliding core provided on the movable mold in the moving direction of the movable mold. By the movement of the movable mold, the first pressing plate connected to the movable mold by the connection pin is also moved integrally. At a position where the cavity forming projection of the sliding core provided on the movable mold is separated from the casting molding recess, the movement of the first pressing plate is restricted and the first pressing plate is stopped.

Next, the movement of the first pressing plate is restricted, and the movable mold connected to the first pressing plate is stopped at that position. When the operating body continues to move in this state, a pair of holding pieces that hold the locked projection that connects the operating body and the movable mold rotate against the urging force, and the holding piece Undressed,
Only the actuator is moved further.

When only the operating body is moved and the movable mold is stopped, the middle piece comes off from the space between the pair of sliding cores, and the tip is inclined from both sides of the operating body in a direction approaching each other. Since the protruding operating pins are engaged with the inclined engagement holes formed in the pair of sliding cores from the insertion portions formed in the movable mold, the sliding cores move in the directions approaching each other. The intermediate piece is moved toward the space where the slide has escaped, and the cavity forming projection of the sliding core is separated from the inner periphery of the cavity casting.

When only the operating body is moved and the movable mold is stopped, the engaging pin projecting from the operating body in the mold opening direction of the movable mold is rotatably pivoted to the first pressing plate. The rotating body is engaged with the supported rotating body, and the rotating body is pressed and rotated to press the second pressing plate, and the second pressing plate is pressed in the direction opposite to the mold opening direction of the movable mold, and the second pressing is performed. The pressing pin provided on the plate moves in the direction opposite to the mold opening direction of the movable mold, protrudes from the joint surface of the movable mold with the fixed mold, and the cast product is separated from the movable mold side and dropped. . The return pin also moves in the same direction at the same time, and projects from the joint surface of the movable mold with the fixed mold.

Next, when the operating body is moved in the mold closing direction of the movable mold by a hydraulic device or the like, the operating body approaches the movable mold, and the tip is inclined from the operating body in a direction to approach each other. The operating pins provided are engaged with the inclined engagement holes formed in the pair of sliding cores from the insertion portions formed in the movable mold, and the sliding cores are moved in directions away from each other. Also, the middle piece enters between the pair of sliding cores, and the pair of holding pieces for holding the locked projection rotate and hold against the urging force, thereby holding the operating body and the movable metal. Combine with the type.

Further, when the operating body is moved in the closing direction of the movable mold, the return pin comes into contact with and is pressed by the fixed mold, and the return pin is moved in the direction opposite to the closing direction of the movable mold. The second pressing plate is also pressed and moved by the return pin, and the movement of the second pressing plate also moves the pressing pin in the same direction as the return pin, so that both the return pin and the pressing pin are joined to the fixed mold of the movable mold. Evacuated from the plane.

Then, when the second pressing plate is moved in the mold opening direction of the movable mold, the second pressing plate is engaged with a rotating body rotatably supported on the first pressing plate, The rotating body is pressed and rotated to return and rotate.

In this state, a pair of sliding core split cavities forming protrusions are disposed in the casting molding recess of the fixed mold, and a middle piece is inserted between the pair of sliding cores. A cavity is formed between the casting molding concave portion and the cavity forming projection, and the next casting can be performed by pressing the molten metal into the cavity.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of a casting mold according to the present invention will be described with reference to FIGS.

FIG. 1 is a front view of a casting mold, FIG. 2 is a vertical sectional front view, FIG. 3 is a plan view of a fixed mold, FIG. 4 is a bottom view of a movable mold, and FIG. FIGS. 1 to 4 are partially cutaway side views showing a portion. In FIGS. 1 to 4, reference numeral 1 denotes a fixed mold, and 2 denotes a movable mold.

As shown in FIG. 2 and FIG.
In the joint surface 3 with the movable mold 2, there are formed casting molding recesses 4 and 4 of a ring-shaped casting product on the left and right. Further, operating pin escape recesses 5 and 5 are formed on both sides of the molding recesses 4 and 4, respectively. Further, a molten metal nozzle hole 6 is opened in the vicinity of an intermediate portion of the joining surface 3 of the casting molding concave portions 4, 4 of the fixed mold 1, and a positioning hole 7 is opened in a corner of the joining surface 3. ing.

As shown in FIGS. 1 and 2, the movable mold 2 is provided on an operating body 8 provided to be able to advance and retreat with respect to the fixed mold 1 so as to be able to advance and retreat toward the fixed mold 1. Is provided. The operating body 8 is advanced and retracted by a hydraulic device (not shown), and a concave portion 9 opened at the outer end surface is formed at the center. An operating pin 10 is provided on the operating body 8 so as to be inclined toward the stationary mold 1 in such a manner that the tips approach each other from both sides. The movable die 2 has an insertion hole 11 for the operation pin 10. Then, as shown in FIG. 2, a pair of holding pieces 1
2 and 12 are rotatably supported by a shaft 13, respectively. The holding pieces 12 and 12 are urged by a spring 14 in a direction approaching each other, and are detachably attached to the holding pieces 12 and 12. Locked projections 15 are provided on both sides of the movable mold 2.

Further, as shown in FIGS. 2 and 4, the movable mold 2 is provided with a pair of sliding cores 16 so as to be movable in a direction perpendicular to the moving direction of the movable mold 2. . An engaging portion 17 formed along the moving direction of the pair of sliding cores 16, 16 is engaged with a dovetail groove 18 formed in the movable mold 2, and the pair of sliding cores 16, 16 is moved. It is movably supported. The pair of sliding cores 16, 16 are provided with split cavity forming projections 19, 19 disposed in the casting molding recess 4 of the fixed mold 1. The movable mold 2 protrudes from the joint surface 20 with the fixed mold 1, and a cavity is formed between the cavity forming projections 19, 19 and the casting molding recess 4.

An insertion hole formed in the movable mold 2
The operating pin 10 protruding from 11 is connected to the pair of sliding cores 16, 16.
The sliding cores 16 and 16 are slidably engaged with the inclined engagement holes 21 respectively formed by the movable mold 2 and the operating body 8.

Reference numeral 22 denotes a center piece, which is fixed to the operating body 8 and is inserted through the insertion hole 23 of the movable mold 2 and between the pair of sliding cores 16, 16. The sliding cores 16 and 16 are arranged so as to be able to advance and retreat in a direction orthogonal to the sliding direction of the sliding cores. The tip is formed on an inclined surface such that the tip is narrower.

Further, as shown in FIG.
A runner 24 facing the molten metal nozzle hole 6 is formed on the joint surface 20 of the fixed die 1 with the fixed die 1.

A plurality of positioning pins 25 projecting from the operating body 8 are inserted through positioning holes 26 formed in the movable mold 2 into the positioning holes 7 of the fixed mold 1 so that the fixed mold 1 And the movable mold 2 are aligned.

Further, as shown in FIG. 2, a connecting pin 28 protruding in the mold opening direction of the movable mold 2 penetrates the through hole of the operating body 8 and projects into the recess 9 of the operating body 8. The connecting pin 28 is provided in the first recessed portion 9 of the operating body 8.
Is connected to the pressing plate 29. The first pressing plate 29 comes into contact with the stopper 30, so that the amount of movement of the movable mold 2 in the mold opening direction is regulated.

As shown in FIGS. 1, 2 and 5, the center pressing portion 33 of the first pressing plate 29
Is rotatably supported by a shaft 31, and an engaging pin 34 that engages with one end of the rotating body 32 is moved from the operating body 8 to the movable mold 2.
Are protruded in the mold opening direction.

Further, as shown in FIG. 1, a second pressing plate 35 is disposed in the recess 9 between the first pressing plate 29 and the operating body 8. The second pressing plate 35 is formed with through holes 36 and 37 through which the connecting pin 28 and the engaging pin 34 penetrate freely.

As shown in FIG. 2, the second pressing plate 35 is provided with a return pin 38 whose tip is pressed against the fixed mold 1 by pressing. And the movable mold 2 so as to be able to advance and retreat. Further, the second pressing plate 35 is provided with a pressing pin 40 of a cast molded product that penetrates the operating body 8 and the movable mold 2 so as to be able to advance and retreat.

Next, the operation of this embodiment will be described.

As shown in FIG. 1 and FIG.
A pair of sliding cores 16, 16 is provided with a split cavity forming projection 19 in the casting molding concave portion 4 of FIG.
A cavity is formed between the casting molding concave portion 4 and the cavity forming projection 19 with the middle piece 22 inserted between 6 and 16.

In this state, the molten metal is press-fitted from the molten metal nozzle hole 6 of the fixed mold 1 and injected into the cavity through the runner 24 of the movable mold 2 to perform casting.

As shown in FIG. 6, when the movable body 2 is moved in a mold opening direction in which the movable mold 2 is separated from the fixed mold 1 by a hydraulic device or the like, the movable body 8 and the movable mold 2 are separated from each other. Since the locked projection 15 is sandwiched between the pair of sandwiching pieces 12, the movable mold 2 and the middle piece 22 provided on the operating body 8 move integrally with the operating body 8.

The movement of the movable mold 2 causes the sliding cores 16 provided on the movable mold 2 to move in the moving direction of the movable mold 2. By the movement of the movable mold 2, the first pressing plate 29 connected to the movable mold 2 by the connection pin 28 is also moved integrally. At this time, the sliding cores 16 provided on the movable mold 2,
At the position where the sixteen cavity forming projections 19 are separated from the casting molding concave part 4, the first pressing plate 29 abuts against the stopper 30, is restricted in movement, and stops.

Next, the movement of the first pressing plate 29 is restricted by the stopper 30, and the movable mold 2 connected to the first pressing plate 29 is stopped at that position. When the operating body 8 continues to move in this state, as shown in FIG. 7, a pair of holding pieces 12, 12 holding the locked projection 15 connecting the operating body 8 and the movable mold 2 are spring-loaded. Rotates against the biasing force of 14,
The sandwiching of the sandwiching pieces 12, 12 is released, and only the operating body 8 is further moved. At this time, as shown in FIG. 8, one end of a rotating body 32 in which an engaging pin 34 projecting from the operating body 8 in the mold opening direction of the movable mold 2 is rotatably supported on the first pressing plate 29. , And the other end of the rotating body 32 is rotated to the second pressing plate 35 side.

When only the operating body 8 moves and the movable mold 2 is stopped, as shown in FIGS.
The movable pin 22 is disengaged from the pair of sliding cores 16, and the operating pins 10, 10, which are protruded from both sides of the operating body 8 so as to be inclined in a direction approaching each other, are mounted on the movable mold 8. The sliding core is engaged with the inclined engaging holes 21 formed in the pair of sliding cores 16 from the insertion hole 11 formed in the sliding core.
16 and 16 are moved toward the space in which the middle piece 22 has come out in the direction of approaching each other, and the cavity forming projections 19 and 19 of the sliding cores 16 and 16 are moved from the inner periphery of the cast molded product 41 of the cavity. Be separated.

At the same time, when only the operating body 8 moves and the movable mold 2 is stopped, the engaging pin 34 of the operating body 8 is rotatable on the first pressing plate 29 as shown in FIG. The rotating body 32 is pressed at one end thereof, and the rotating body 32 is pressed and rotated to press the second pressing plate 35 toward the movable mold 2, and the second pressing plate 35 is pressed.
9 is pressed in the direction opposite to the mold opening direction of the movable mold 2, and FIG.
As shown in FIG. 10, the pressing pin 40 provided on the second pressing plate 35 moves to the side opposite to the opening direction of the movable mold 2, and the joint surface 20 of the movable mold 2 with the fixed mold 1. The pressing pin 40 is separated from the cast mold 41 and the molten metal mass 43 in the molten metal nozzle hole 6 from the movable mold 2 side and dropped.

The return pin 38 provided on the second pressing plate 35
Also move in the same direction and protrude from the joint surface 20 of the movable mold 2 with the fixed mold 1.

Then, in preparation for the next casting, when the working body 8 is moved in the mold closing direction of the movable mold 2 in the opposite direction by a hydraulic device or the like, the working body 8 approaches the movable mold 2. An operating pin 10 projecting from the operating body 8 in a direction in which the tips approach each other is provided with an operating pin 10 formed in a pair of sliding cores 16 through an insertion hole 11 formed in the movable mold 2. By engaging with the hole 21, the sliding cores 16, 16 are moved in directions away from each other. In addition, the middle piece 22 enters between the pair of sliding cores 16, 16, and the pair of holding pieces 12, 12 for holding the locked projection 15 rotate against the urging force to hold the locking projection 15. And the operating body 8 and the movable mold 2 are connected.

Further, when the operating body 8 is moved in the mold closing direction of the movable mold 2, the return pin 38 is moved to the joint surface 3 of the fixed mold 1.
The return pin 38 is moved in a direction opposite to the closing direction of the movable mold 2 by being contacted and pressed.
The pressing plate 35 also moves by pressing, and by the movement of the second pressing plate 35, the pressing pin 40 is also moved in the same direction as the return pin 38, so that the return pin 38
And the pressing pin 40 are retracted from the joint surface of the movable mold with the fixed mold.

As shown in FIGS. 1 and 2, when the second pressing plate 35 is moved in the mold opening direction of the movable mold 2, the second pressing plate 35 is moved to the first pressing plate 29. The rotating body 32 engages with the rotating body 32 rotatably supported, and the rotating body 32 is pressed and rotated to return and rotate.

In this state, the split cavity forming projection 19 of the pair of sliding cores 16, 16 is disposed in the casting molding recess 4 of the fixed mold 1. Nakakoma in between
A cavity is formed between the casting molding concave portion 4 and the cavity forming projection 19 with the 22 inserted, and the next casting can be performed by pressing the molten metal into the cavity.

In the above embodiment, the movable mold 2 and the operating body 8 can be moved in the vertical direction as shown in the figure, but the movable mold 2 and the operating body 8 are moved with respect to the fixed mold 1. It can also be movable from the left and right.

[0047]

According to the present invention, it is possible to reliably remove the cast product in a state where the cast product is securely separated from the fixed mold and the movable mold is separated from the fixed mold, and the inner peripheral portion is continuously formed. The casting of a ring-shaped cast product having a concave and convex surface such as a screw in a portion can be continuously performed.

[Brief description of the drawings]

FIG. 1 is a front view of a casting mold showing one embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the same.

FIG. 3 is a plan view of the same fixed mold.

FIG. 4 is a bottom view of the movable mold.

FIG. 5 is a partially cutaway side view showing a portion of the engaging pin and a rotating body.

FIG. 6 is a longitudinal sectional front view showing a state where the movable mold is separated from a fixed mold.

FIG. 7 is a front view showing a state in which the movable mold is further separated from the operating body.

FIG. 8 is a partially cutaway side view showing a portion of the engaging pin and a rotating body.

FIG. 9 is a front view showing a release state in which the sliding core has moved.

FIG. 10 is a vertical sectional front view of the same.

FIG. 11 is a side view, partially cut away, showing a portion of the engagement pin and the rotating body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed mold 2 Movable mold 4 Molding recess 8 Actuator 10 Actuator pin 11 Insertion hole 12 Clamping piece 15 Locked projection 16 Sliding core 19 Cavity forming projection 22 Middle piece 28 Connecting pin 29 First Pressing plate 32 Rotating body 34 Engagement pin 35 Second pressing plate 38 Return pin 40 Pressing pin 41 Cast molding

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 17/22 B22C 9/06 B29C 45/33 B29C 45/40

Claims (1)

(57) [Claims] 1. A fixed mold having a molding recess 4 formed therein.
1, and the operating body 8 provided retractably with respect to the stationary die 1, a movable die 2 provided to be retractable toward the stationary die 1 to the operating body 8, the movable mold each projecting mold 2 the split cavity forming protrusion 19 to form a cavity disposed in the movable mold the casting of the stationary mold 1 movably arranged in the movement direction with the direction orthogonal to the second shaping recess 4 A pair of sliding cores 16 and 16 are inserted between the pair of sliding cores 16 and 16 through the insertion holes 23 of the movable mold 2 attached to the operating body 8. and a Chukoma 22 which is movably disposed in the sliding direction and the perpendicular direction of 16, 16, distal from the both sides of the actuating body 8 is projected to be inclined toward each other the movable mold slidably engaged through the insertion hole 11 formed in the 2 to the inclined engaging hole 21 formed respectively on the pair of slide core 16, 16 The rotating pin 10, 10 projecting from the operating body 8 and the pair of clipping pieces is urged in the direction of clamped the locked protruding portion 15 protruding from the one of the movable mold 2
12 and 12 the other to rotatably provided on a connecting pin 28 which projects toward the movable mold 2 in the mold opening direction of the movable die 2 come through the through hole of the operating member 8 < The movable amount of the movable mold 2 in the mold opening direction is coupled to a first pressing plate 29 regulated by a stopper 30 , and the first pressing plate 29 is rotatably supported by the first pressing plate 29. An engaging pin 34 that engages with the rotating body 32 protrudes from the operating body 8 in the mold opening direction of the movable mold 2 and is located between the first pressing plate 29 and the operating body 8. Distribute
And the rotation of the rotating body 32 by the engagement pin 34
Pressed and pressed in the direction opposite to the mold opening direction of the movable mold 2
The connection pin 28 and the engagement pin are applied to the second pressing plate 35 to be pressed.
Through holes 36 and 37 are formed to penetrate the movable member 34 so as to be able to advance and retreat.
Freely penetrated the tip stationary die 1 is pressed in contact provided with the first pressing plate 29 return pins 38 attempting to bring the movable mold and the actuating body 8 in the second pressing plate 35 To mold 2
The cast product is penetrated so as to be able to advance and retreat from the movable mold 2 side
A casting mold comprising a pressing pin 40 for peeling .