JPH069733Y2 - Casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a casting machine for casting a key rotor or the like.

(Prior Art) Conventionally, in a key rotor casting machine, a core for forming a key insertion hole and a key plate insertion hole of a key rotor is arranged in a cavity of a die block, and a casting material is placed in the cavity. The key rotor is cast by being injected.

(Problems to be solved by the invention) However, in the conventional casting machine, there is no dedicated positioning mechanism for holding the core in the position where it has entered the cavity, so when the injection pressure of the casting material is high. However, there is a possibility that the core moves within the die block, and in that case, there is a problem in that it is impossible to form a precision casting with high dimensional accuracy.

(Object of the Invention) The present invention was made in order to solve the above problems, and the purpose thereof is to accurately position a die block or a core at a predetermined position during mold clamping. It is an object of the present invention to provide a casting machine capable of forming a precision casting product with high dimensional accuracy by preventing the die block, the core, and the like from moving due to the pressure during injection.

(Means for Solving the Problem) In order to achieve the above-mentioned object, in the present invention, a mold formed in a hollow cylindrical shape and a reciprocating movable member are arranged in a hollow portion of the mold between two predetermined positions. A die block having a core guide hole communicating with the cavity and having a cavity substantially in the center thereof, and a position where the tip end portion is inserted into the core guide hole of the die block and the cavity. A core that is reciprocated between a position spaced apart from the mold, and a die that is reciprocably disposed on one side of the mold along an axis orthogonal to the axis of movement of the die block and the core. The block is arranged at one moving end position, and when the core is inserted and arranged in the cavity, the block is provided with a positioning pin that penetrates the mold frame and the die block and locks the core when the core moves forward. ing.

(Operation) Therefore, according to this invention, when the die block is arranged at one moving end position in the mold and the core is inserted into the cavity, the positioning pin is moved forward,
The core is locked by penetrating the mold and die block. In this state, the positioning pin moves in the direction orthogonal to the moving axes of the die block and the core, so that when the casting material is injected, the pressure causes the positioning pin to be locked with the core. No force is applied in the releasing direction. As a result, delusions of die blocks and cores are reliably prevented.

(Embodiment) An embodiment of a key rotor casting machine embodying the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1 (a) and FIG. 2, the mold 2 placed on the base 1 is made of a metal material in the shape of a rectangular tube, and openings 3 and 4 are formed at both ends thereof. . A base plate 1 supports a retainer plate 5 that can be opened and closed by opening a right end opening 3 of a formwork 2, and a hydraulic cylinder (not shown) is actuated to close a closed position shown in FIG. 1 (a) by a solid line. And the open position shown by the two-dot chain line in the figure. Further, the retainer plate 5 is formed with a through hole 6 that opens at the top.

A die block 8 in the form of a square pole is inserted in the hollow portion 2a of the mold 2 so as to be reciprocally movable in the left-right direction, and the left moving end position shown in FIG. As shown in c), the right end is reciprocated between the right end and the right moving end position that engages with the retainer plate 5. A die 10 having a cavity 9 for molding a key rotor is housed in the center of the die block 8. The cavity 9 is opened in front of the die 10 and the die block 8, and a front mold insertion hole 11 is formed in the front of the mold 2 so that the openings of the cavity 9 can face each other. A front mold 12 for forming a key insertion hole in the key rotor is provided in front of the mold 2.
When the front mold 12 is moved to the rearward moving end position, the arrow 12a provided at the tip of the front mold 12 passes through the front mold insertion hole 11 as shown in FIG. The front mold 12 is placed in the cavity 9 and the front opening of the cavity 9 is closed.

On the central axis of the die block 8, openings are formed at both ends of the die block 8 and a cavity 9 of the die 10 is formed.
There is formed a pair of core guide holes 13 and 14 communicating from the left and right sides. Further, a connecting frame 15 having a hollow portion is fixed to the left end of the die block 8, and a first core 16 having a shaft shape is formed in the left core guide hole 13 so as to penetrate the connecting frame 15. Is reciprocally inserted to the left and right. A protrusion 17 that can be engaged and disengaged with the left end surface of the die block 8 and the left inner surface of the connecting frame 15 is mounted in the middle portion of the first core 16, and the right end portion has a key plate insertion hole in the key rotor. To form the cavity 9
A plurality of arrows 18 (only one is shown) are formed that can enter the inside.

Further, a piston 19 of a hydraulic cylinder is connected to the left end of the first core 16, and when the piston 19 is arranged at the left moving end shown in FIG. 1 (a) based on the operation of the hydraulic cylinder. , The arrow 18 of the first core 16 is the cavity 9
The die block 8 is separated from the die block 8 and the die block 8 is disposed at the leftward movement end position shown in FIG. Also, when the piston 19 is moved forward to the intermediate position shown in FIG. 1 (b) for mold clamping, the arrow portion 18 of the first core 16 enters the cavity 9 and the protrusion 17 causes the die block to move. When the piston 19 is engaged with the left end surface of 8 and protrudes to the right movement end shown in FIG. 1 (c), the die block 8 is moved forward by the engagement with the protrusion 17, The retainer plate 5 is engaged.

So as to pass through the through hole 6 of the retainer plate 5,
A shaft-shaped second core 20 is reciprocally inserted into the right core guide hole 14. A recess 22 provided on the right end surface of the die block 8 is provided on the outer periphery of the middle portion of the second core 20.
Also, a detachable protrusion 23 is formed on the inner side surface of the retainer plate 5, and a detachable protrusion 24 is formed on the outer side surface of the retainer plate 5 at the right end portion. Further, at the left end of the second core 20, a plurality of arrow portions 25 (only one is shown) that can be inserted into the cavity 9 to form a key plate insertion hole in the key rotor are provided.
When entering the cavity 9, the plurality of arrow portions 18 of the first core 16 are alternately arranged.

Positioning holes 26, 27, 28 which can be arranged on one axis during mold clamping are formed at predetermined positions of the mold 2, the die block 8 and the first core 16, respectively. That is, the die block 8 and each core 16, 20
A hydraulic cylinder 30 having a positioning pin 29 that can reciprocate in a direction orthogonal to the moving axis of the is arranged. The positioning pin 29 is always arranged in the rest position shown in FIG. 1 (a), and the mold frame 2, the die block 8 and the first core 16 are in the position shown in FIG. 1 (c) during mold clamping. When the positioning holes 26 to 28 are arranged on one axis, the positioning pin 29 is moved downward by the hydraulic cylinder 30, and the positioning pin 29 is moved to the positioning hole 2 respectively.
6 to 28 are entered so that the respective members 2, 8 and 16 are positioned.

Now, in the casting machine configured as described above, the mold 2
When replacing each member such as the die block 8 in the inside, the retainer plate 5 is opened as shown by a two-dot chain line in the same figure with the die block 8 etc. arranged in the position shown in FIG. 1 (a). It is lowered to the position and the right end opening 3 of the mold 2 is opened. Then, after disconnecting the connection between the piston 19 and the first core 16, the second core 20, the die block 8 and the first core 16 are pulled out from the right end opening 3 of the form 2, Each of the above-mentioned members is connected to the frame 2 without the 19 being an obstacle.
Can be easily removed from.

Then, in a state where the cores 16 and 20 are previously inserted into another die block 8, they are inserted from the right end opening 3 into the mold 2
After being pushed into the hollow portion 2a of the first core 16, the first core 16 is connected to the piston 19, and then the retainer plate 5 is inserted into the first core 16.
The mold exchange can be easily completed in a short time by raising to the closed position shown by the solid line in FIG.

Subsequently, when casting the key rotor using the exchanged mold, first, the piston 19 of the hydraulic cylinder (not shown) is
When the first core 16 is moved forward to the right in FIG. 1 (a) by the arrow, its arrow portion 18 enters the cavity 9 and at the same time, the arrow portion 18 moves as shown in FIG. 1 (b). The die block 8 is moved forward to the right following the forward movement of the first core 16 by the end portion of the pressing portion. With the forward movement of the die block 8, the arrow portion 25 of the second core 20 enters the cavity 9 and at the same time, the end portions of the holding portion of the arrow portion 25 cause the both portions 8 and 20 to integrally move to the right. To be done. Then, when the protrusion 23 of the second core 20 and the right end surface of the die block are engaged with the retainer plate 5, the forward movement of each member is stopped, and the die is clamped with the retainer plate 5 as a reference. Then, the positioning holes 26 of the members 2, 8 and 16
28 are arranged on the same axis. Subsequently, the positioning pin 29 is lowered to enter the positioning holes 26 to 28,
Each member is accurately positioned at a predetermined position.

Further, in this embodiment, the nozzle 31 is brought close to the gate of the cavity 9 at the same time when the positioning pin 29 is lowered. Next, the arrow 12a of the front die 12 is inserted into the cavity 9 through the front die insertion hole 11 and the front die 12
This closes the front opening of the cavity 9. In this state, the casting material is injected from the nozzle 31 into the cavity 9, and a key rotor corresponding to the shapes of the cavity 9 and the cores 16 and 20 is molded.

Subsequently, after the nozzle 31 is separated from the cavity 9 to the rear, the front mold 12 is separated from the front mold insertion hole 11 to the front, and the positioning pin 29 is further lifted and separated from the respective positioning holes 26 to 28. Then, the piston 19 of the hydraulic cylinder moves the first core 16 back from the position shown in FIG. 1 (c) to the position shown in FIG. 1 (a). Then, first, only the first core 16 is moved back, and when the protrusion 17 of the first core 16 is engaged with the inner surface of the connecting frame 15, the first core 1
The die block 8 is moved back in accordance with 6. Then, when the first core 16 is returned to the leftward movement end position, the return movements of the first core 16 and the die block 8 are stopped. On the other hand, the second core 20 is the core guide hole 14 of the die block 8.
When the protrusion 24 of the second core 20 is engaged with the outer side surface of the retainer plate 5, the return movement is stopped by the friction between the and the die block 8. .

Then, in the state where the returning movement of each member is stopped, as shown in FIG.
25 is spaced from the cavity 9 on both sides. In this state, the key rotor molded product is pushed forward from the cavity 9 by a push pin (not shown), and the molding operation for one cycle is completed.

As described above, in this embodiment, after the mold is clamped, the positioning pin 29 penetrates the mold frame 2 and the die block 8 and is locked to the first core 16, and the positioning pin 29 causes the members 2, 8, 16 is positioned in a connected state, and the positioning pin 29 is moved in the direction orthogonal to the moving axis of the die block 8 and the cores 16 and 20, so that the pressure applied to the casting material at the time of injection. As a result, no force is applied to the positioning pin 29 in the direction of releasing the locked state with the cores 16 and 20, so that the positions of the cores 16 and 20 and the die block 8 due to the injection pressure of the casting material. It is possible to prevent the displacement and the displacement between the die block 8 and the mold 2 in advance, so that it is possible to cast a precision molded product with high dimensional accuracy.

Further, in this embodiment, when foreign matter such as burrs generated by molding is caught between the arrow portions 18 and 25 of the cores 16 and 20, the core 16 does not enter the proper position, and therefore, The positioning pin 29 serves as the positioning hole 2 for the first core 16.
8 cannot be entered, and the amount of protrusion of the pin 29 is reduced. Therefore, if the projection amount of the positioning pin 29 can be detected, it is possible to detect the mold clamping failure based on the detection of the projection amount.

The invention is not limited to the above embodiment,
It is also possible to embody the present invention in a casting machine for molding castings other than the key rotor.

(Effect of the Invention) As described in detail above, the present invention can accurately position the die block and the core at a predetermined position by the positioning pin that moves in the direction orthogonal to the axis of movement during mold clamping. This has an excellent effect that it is possible to prevent a die block, a core, or the like from moving due to the pressure when a casting material is injected, and to form a precision casting with high dimensional accuracy.

[Brief description of drawings]

1A is a front sectional view of a casting machine embodying the present invention, FIGS. 1B and 1C are front sectional views showing an operating state of the casting machine, and FIG. 2 is a mold clamping state. It is a top view of a casting machine. 2 ... Formwork, 8 ... Die block, 9 ... Cavity, 13 ...
Core guiding hole, 16 ... First core, 29 ... Positioning pin.

Claims (1)

[Scope of utility model registration request] 1. A mold (2) formed in the shape of a hollow cylinder and a cavity (9) which is reciprocally movable between two predetermined positions in a hollow part (2a) of the mold (2). A core guide hole (1) which has and also communicates with the cavity (9).
3) provided with a die block (8) and a core guide hole (13) of the die block (8), and the tip end thereof is separated from the cavity (9) and the position where the tip enters the cavity (9). A core (16) which is reciprocated between a position and the die block (8) on one side of the mold (2)
And the core (16) is arranged so as to be capable of reciprocating along an axis orthogonal to the axis of movement of the core (16), the die block (8) is arranged at one moving end position, and the core (16) is a cavity. And a positioning pin (29) which penetrates through the mold (2) and the die block (8) and locks the core (16) when it is placed in (9) and is moved forward. A casting machine characterized by that.