JPH09216040A - Die cast machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a product less in air inclusion in an injection sleeve and die cavity and less in generation of molten metal oxide or blister by fixing a common base in an inclined manner with the prescribed angle of inclination relative to the level. SOLUTION: A common base 8 to load a die device 10 and a clamping device 20 is fixed in an inclined manner at the prescribed angle of inclination in a range of 5-75 deg. relative to the level. An injection sleeve 32 is fitted to a tip part of a cylindrical docking frame 34 arranged before an injection cylinder in an advancing/retractable manner in a tiltable manner between the vertical condition and the angle of inclination. A plunger chip connected to a piston rod of the injection cylinder is fitted in the injection sleeve 32 in an advancing/ retracting manner. Air inclusion is less, and generation of molten metal oxide and blister is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die cast molding machine for molding a molten liquid metal or a semi-molten metal such as an aluminum alloy or a magnesium alloy, and particularly, (1) a mold release agent applied to a mold and a molten metal. (2) Die cast capable of forming a good cast product that suppresses the reaction with (2) prevents air entrapment during injection filling of the molten metal into the mold cavity and prevents the formation of blisters on the surface of the cast product as much as possible after heat treatment. The present invention relates to a molding machine.

[0002]

2. Description of the Related Art A die-cast molding method using a horizontal casting type die-cast molding machine as shown in FIG. 7 is widely adopted as a method having a high production capacity for constraining a casting having a complicated shape. On the other hand, the vertical casting type die-cast molding method in which the injection device is vertical to the floor surface is used as a method for molding a sound casting with little air entrainment by low-speed injection.

[0003]

However, in the horizontal casting die-cast molding machine, (1) the injection sleeve is horizontal, so that the molten metal (molten liquid metal) or the semi-molten metal is quiet during injection filling. It is difficult to fill the mold cavity from the injection sleeve. For example, as shown in FIG. 8, air bubbles f are generated in the molten metal (molten liquid metal) L or the semi-molten metal M during injection to cause air inside the casting product. It is easy to get caught, and (2) because the contact area between the molten metal and the inner surface of the injection sleeve is large in the injection sleeve, the temperature drop during injection filling is large and the temperature of the molten metal filled in the mold is significantly reduced. There is a drawback that the solidified layer generated in the injection sleeve easily mixes inside the product,
As a countermeasure against this, if the molten metal is injected with restraint in order to prevent the temperature from decreasing, air entrainment in the molten metal is promoted as in (1). Further, the horizontal casting die-cast molding machine has a problem that it is particularly difficult when the semi-molten metal has a high liquid phase ratio when the semi-molten metal is introduced into the hot water supply port which is the opening of the injection sleeve. On the other hand, in a vertical casting die cast molding machine, when a lower mold having a recess such as an automobile wheel is used, the water content of the water-soluble release agent applied to the mold surface is, for example, Figure 6
As shown in (a), it is almost evenly accumulated around the circumference, and it is difficult to completely purge even if high-speed and high-pressure air blowing is performed to eliminate this, and molding is performed with unnecessary moisture left in the mold. As a result, the cast product is adversely affected (the formation of molten oxide such as alumina and the formation of blisters accompanying the generation of hydrogen gas). Further, in a mold for molding an automobile wheel as shown in FIG. 6 (a), which has a plan to allow the molten metal entering from the gate into the mold cavity to move in any radial direction, If there is no direction in which air escapes and the injection speed increases, air may be trapped inside the product.

[0004]

In order to solve the above problems, in the first invention, a mold provided with a pair of left and right dies or a pair of upper and lower dies that are loaded on a common base and can be opened and closed. A die cast molding machine formed by a device, a mold clamping device for the mold, and an injection device including an injection sleeve for injecting and filling molten metal into a mold cavity formed by both molds, The common base is 5 ° to 7 with respect to the horizontal
The injection sleeve is fixed by being inclined at a constant inclination angle within a range of 5 °, and the injection sleeve is of a cylindrical shape which is arranged to be movable forward and backward in front of an injection cylinder which is inclinable between a vertical state and the inclination angle. The plunger tip, which is fitted to the tip of the docking frame and is connected to the piston rod of the injection cylinder, is fitted in the injection sleeve so as to be movable back and forth. That is, in the present invention, the injection filling and the molding are performed as an oblique casting located between the horizontal casting and the vertical casting. Further, in the second invention, the mold device is provided with a pair of left and right molds or a pair of upper and lower molds that are stacked on a common base and can be opened and closed, a mold clamping device of the mold, and the molds. A die cast molding machine formed by an injection device comprising an injection sleeve for injecting and filling molten metal into a mold cavity, wherein the common base is from a horizontal state to an inclination angle of 75 ° with respect to the horizontal state. The injection sleeve is provided with a tilting means that can be tilted, and the injection sleeve is fitted to a tip end portion of a cylindrical docking frame that is arranged to move forward and backward in front of an injection cylinder that can tilt between a vertical state and the tilt angle. And a plunger tip connected to the piston rod of the injection cylinder is fitted in the injection sleeve so as to be movable back and forth. Further, in the third invention, the tilting means of the common base in the second invention is a hydraulic cylinder or an electric motor for rotating the common base around a horizontal center of gravity axis attached to the common base. . Further, in the fourth invention, in the first to third inventions, the tilting means of the injection cylinder is a hydraulic cylinder or an electric motor.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a first aspect of the present invention, a mold device equipped with a pair of left and right molds or a pair of upper and lower molds that are loaded on a common base and can be opened and closed, a mold clamping device for the mold, A die cast molding machine formed by an injection device including an injection sleeve for injecting and filling molten metal into a mold cavity formed by both molds, wherein the common base is 5 ° to 75 ° with respect to the horizontal. , A cylindrical docking frame which is fixedly tilted at a constant tilt angle in the range of 10 mm, and the injection sleeve is arranged so as to be movable forward and backward in front of an injection cylinder which is tiltable between a vertical state and the tilt angle. And a plunger tip connected to the piston rod of the injection cylinder and fitted in the injection sleeve so as to be movable back and forth. In the second invention, the common base is Horizontal to horizontal The tilting means is configured to be tiltable up to a tilt angle of 75 ° with respect to the state. Therefore, after putting the molten metal or the semi-molten metal in the injection sleeve in the vertical state, the injection cylinder, the docking frame and the injection sleeve are integrally tilted to a predetermined angle,
In the first invention, the tip end of the injection sleeve is directly matched with the hot water supply port of the inclined mold, and in the second invention, the common frame is tilted to a predetermined angle and then the hot water supply port of the inclined mold is provided. The tip of the injection sleeve is matched as it is, and then injection filling is performed, and the molten metal or semi-molten metal in the injection sleeve is injection-filled into the mold cavity. By injecting and filling in this way, the molten metal or semi-molten metal is pressed and moved by the plunger tip in the diagonally inclined injection sleeve. Since the contact area is small, the cooling rate is small and the air entrainment is small. Further, as compared with the case of vertical casting, the recesses of the lower mold are not circumferentially uniform, and the moisture after the release agent is injected is gathered by the gravity action in the vicinity of the lowest point of the recesses caused by the diagonal arrangement. Therefore, the mold water removal by the air blow is more completely performed. In addition, it is difficult to maintain the shape of the metal material used for molding before inserting into the injection sleeve without a container, or a semi-molten metal with a high liquid phase ratio, or without a container, a solid-liquid metal before inserting into the injection sleeve. Because the coexistence temperature range is narrow and temperature control is difficult, it is difficult to maintain the shape of metal materials such as wrought alloys.
Since the metal material can be easily inserted into a vertical injection sleeve while maintaining its shape and can be molded as it is, a molded product having a uniform structure can be obtained. Further, in the third invention, the tilting means of the common base in the second invention is specifically set, and the common base is tilted by a hydraulic cylinder, or a horizontal center of gravity shaft attached to the common base. Since the common base is turned around by the electric motor, the remote operation is simple. In addition, the fourth
In the invention, since the tilting means of the injection cylinder is specifically set to be a hydraulic cylinder or an electric motor, the injection sleeve can be tilted easily and easily by remote control.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 relate to an embodiment of the present invention, FIG. 1 is an overall configuration diagram of a die cast molding machine (first embodiment), FIG. 2 is a vertical sectional view of an injection device of the die cast molding machine, and FIG. Another embodiment of the die cast molding machine (second
Example) Overall configuration diagram, FIG. 4 is an overall configuration diagram of a die cast molding machine (third embodiment) showing another embodiment, FIG. 5 is a process explanatory diagram of an injection process of the die casting machine, and FIG. It is a comparison explanatory view of this invention and the prior art example which shows the metal mold | die state at the time of a mold spray.

1 and 2, a die cast molding machine 100 includes a mold device 10 including a pair of left and right fixed molds 3 and a movable mold 4, which are fixedly mounted on a fixed plate 1 and a movable plate 2, respectively.
Semi-melting to a mold cavity 5 formed between a mold clamping device 20 (details not shown) for clamping the mold device 10 and both molds 4 (fixed mold 4a, movable mold 4b). A common base 8 that is a die-casting machine formed by an injection device 30 that injects and fills the metal M, and that mounts the mold device 10 and the mold clamping device 20, is mounted on a foundation that is inclined by a required angle in the fixed platen direction. It is fixed. The inclination angle of the common base 8 is 5 ° to 75 °
The angle of inclination is appropriately selected in the range of 30 ° to 45 °. The reason for limiting the numerical value by setting the range of the inclination angle to 5 ° to 75 ° is as follows. When the inclination angle is less than 5 °, it is in the injection sleeve or the mold cavity during injection filling as in the horizontal casting die-cast molding machine. There is a risk that air will be entrained in the molten metal, and conversely, even if the tilt angle is set to 75 ° or more, for example, if the tilt angle is increased to 80 ° to 90 °, the effect of 45 ° to 75 ° is almost obtained. No change, 80
This is because the range of 90 ° to 90 ° approaches the vertical casting mold and the drying after spraying the mold release agent onto the mold becomes insufficient.

On the other hand, the injection device 30 in the embodiment of FIG.
Is a die cast molding machine 100 of the second embodiment shown in FIG.
As shown in FIG. 2, the cylindrical injection sleeve 32 is fitted into the top through hole of the cylindrical docking frame 34, the docking frame 34, and the lower end of the docking frame 34. A plurality of (in many cases, two or four) docking cylinders 36, an injection cylinder 38 that is connected to the docking cylinder 36 to be movable back and forth, and is tiltable around a pin joint 38b, and tilting that controls the tilting of the injection cylinder 38. The docking cylinder 34 is movable forward and backward with respect to the injection cylinder 38, and the semi-molten metal M accommodated in the injection sleeve 32 is fitted in the injection sleeve and is coupled to the injection sleeve. Plunger tip 3 connected to piston rod 38a of injection cylinder 38 via 39a
It can be moved by moving 9 forwards and backwards.

On the other hand, in the die casting machine 100A of the second embodiment of the present invention, the common base 8 is not fixed to the inclined lower foundation surface, but the common base 8 is fixed as shown in FIG. One end on the board side is a pin joint, and the tilting cylinder 9 is disposed on one end on the link housing 3 side so that the die casting machine 100A can be tilted from a horizontal state to a tilt angle of 50 °. Further, the tilting means of the common base 8 is
Not only the tilting cylinder 9 formed of a hydraulic cylinder may be used, but the tilting cylinder 9 may be driven to rotate by a motor or the like around a horizontally projecting rotation shaft on both sides of the central portion (near the center of gravity) of the common base. The tilt angle of the common base 8 is 50
The reason for setting up to ° is the same as described above. Further, in the die casting machine 100B according to the third embodiment of the present invention, as shown in FIG. 4, a pair of front and rear horizontal rotary shafts 8a are provided on the side wall of the central portion near the center of gravity of the common base 8 so as to project.
Bearings can be tilted freely. And, 1 of the rotary shaft 8a
It is configured so that it can be rotated by an electric motor 9A with a brake by a chain 9a via a chain wheel attached at the end.

In the die-cast molding machine 100 of the first embodiment (FIG. 1), the die-cast molding machine 100A of the second embodiment (FIG. 3), and the die-cast molding machine 100B of the third embodiment configured as above. In the injection process, the work proceeds in the following procedure as shown in FIG. That is, in the step (a), the injection sleeve 32, the docking frame 34, and the injection cylinder 38, which are integrated, are connected to the tilting cylinder 40.
Is operated and held vertically or nearly vertically, and the molten metal or the semi-solid metal M in the semi-solid state is inserted into the injection sleeve 32 by a transport device such as a hot water supply robot (not shown), and then the step (b). Then, the injection sleeve 32 is gently tilted so that the same angle as the common base 8 is obtained. Then, in step (c), the docking cylinder 36 is operated to advance the injection sleeve 32 in the direction of the mold with respect to the injection cylinder 38, and the tip of the injection sleeve 32 is fitted into the hot water supply port 1a of the fixed platen 1. Next, in step (d), the injection cylinder 38 is operated and the plunger tip 39 is advanced to inject and fill the molten metal or the semi-molten metal M in the injection sleeve 32 into the mold cavity 5. As described above, the molten metal inserted into the injection sleeve 32 or the semi-molten metal M can be injected and filled into the mold cavity 5 without breaking the shape.

Thus, in the die casting machine 100 and the die casting machines 100A and 100B of the present invention,
Since the main body of the die casting machine (the mold device 10 and the mold clamping device 20 loaded on the common base) is held in an arbitrary inclined state, the molten metal (molten metal) or the semi-molten metal M is injected and filled. , Not only the air entrainment in the injection sleeve 32 at the time of injection is small, but also the disadvantage that the gas escape path in the symmetrical mold cavity in the vertical die casting machine is not directional is eliminated. Since it is located at a lower position than the other, the gas escape path in the mold cavity is directional, and gas entrapment in the mold cavity is small. In addition, in the present invention, the water that accompanies the mold release agent and accumulates in the mold concave portion during the mold release agent spraying work on the mold surface that has been opened prior to the injection filling step is inclined in the mold. Therefore, since it concentrates in one place at the bottom and remains in the mold cavity, it is easy to completely remove it by air blow work for the purpose of removing water, so molding is performed with unnecessary water remaining in the mold. As a result, it is possible to prevent adverse effects on cast products (formation of molten oxide and formation of blisters due to generation of hydrogen gas). That is, as shown in the comparative diagram of FIG. 6, while the stored water content h ₁ of FIG. 6A is substantially uniform in circumference, the stored water content h ₂ of FIG. Concentrated in one place.

The die casting machine 100 and the die casting machines 100A and 100B shown in FIG.
Instead of the tilting cylinder 40, an electric motor may be adopted as the tilting means of No. 2. That is, by rotating the rotary shaft of the joint 38b of FIG. 2 by an electric motor with a brake (or a hydraulic motor may be used instead of the electric motor), the injection sleeve 32, the docking frame 3
4 and the injection cylinder 38 can be tilted integrally.

In the present invention, a die cast molding machine 100 having an injection device 30 having a structure that allows easy insertion of not only molten metal, that is, liquid metal, but also semi-molten metal,
By using 100A and 100B, a semi-molten metal having a high liquid phase ratio, which is difficult to maintain the shape without a container, and a metal material used for molding because temperature control is difficult due to a narrow solid-liquid coexistence temperature range Of semi-molten metal of wrought alloy that is difficult to maintain the shape of
2 easily insert, then molded, without segregation or cracks,
A good cast material can be obtained.

On the other hand, with a die-cast molding machine having a fixed casting sleeve of a horizontal casting type as in the conventional horizontal die-clamping horizontal casting type die-cast molding machine, the shape can be maintained without a container. It is difficult to maintain the shape of the metal material used for molding without a container because it is difficult to control semi-molten metal with a high liquid phase rate and the temperature range of solid-liquid coexistence is narrow and it is difficult to control it before inserting it into the injection sleeve. It is difficult to insert the wrought alloy into the injection sleeve, and it is possible to insert it into the injection sleeve if the temperature is raised to a higher liquid phase ratio to reduce the viscosity of the metal. Although a good product cannot be obtained because hot cracking or segregation of components occurs in the formed product, the present invention allows the semi-molten metal M to be easily inserted into the injection sleeve while maintaining the shape. A good product without

[0015]

As is apparent from the above description,
By using the die cast molding machine of the present invention, it is possible to reduce air entrainment in the injection sleeve and the mold cavity during injection filling, and since the mold is inclined, it is easy to blow away water, and the mold release Since the unnecessary moisture is completely purged after the spray application of the agent, the formation of molten oxide and the formation of blisters due to the generation of hydrogen gas are prevented. Further, since the temperature of the molten metal is unlikely to drop, low-speed injection can be performed correspondingly, so that a dense product with few cavities can be obtained. When molding a semi-molten metal,
Semi-molten metal with a high liquid phase rate that is difficult to maintain without using a container for the shape of the metal material used for molding, and metal that is used for molding because temperature control is difficult because the solid-liquid coexistence temperature range is narrow. The wrought alloy, which is difficult to maintain the shape of the raw material without the container, can be easily taken into the injection sleeve and molded to form a cast product of good quality.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a die cast molding machine (first embodiment) according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an injection device of a die cast molding machine according to an embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a die cast molding machine (second embodiment) according to another embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a die cast molding machine (third embodiment) according to another embodiment of the present invention.

FIG. 5 is a process explanatory diagram of an injection process of the die cast molding machine of the present invention.

FIG. 6 is a comparative explanatory diagram of the present invention and a conventional example showing the state of the mold at the time of spraying the mold.

FIG. 7 is an overall configuration diagram of a conventional horizontal casting die-cast molding machine.

FIG. 8 is an explanatory diagram of an air entrainment state in a horizontal casting die-cast molding machine.

[Explanation of symbols]

1 fixed plate 1a hot water inlet 2 movable plate 3 link housing 4 mold 4a fixed mold 4b movable mold 5 mold cavity 6 tie bar 7 mold clamping cylinder 8 common base 8A pedestal 8a rotary shaft 9 tilting cylinder 9A electric motor 9a chain 10 gold Mold device 20 Mold clamping device 30 Injection device 32 Injection sleeve 34 Docking frame 36 Docking cylinder 38 Injection cylinder 38a Piston rod 38b Pin joint 39 Plunger tip 39a Coupling 40 Tilt cylinder 40a Piston rod 40b Pin joint 100 Die cast molding machine 100A Die cast Molding machine 100B Die cast molding machine L Molten metal (liquid metal) M Semi-molten metal f Bubbles h ₁ and h ₂

Claims (4)

[Claims] 1. A mold device equipped with a pair of right and left molds or a pair of upper and lower molds that are loaded on a common base and can be opened and closed, a mold clamping device for the mold, and a mold formed by both molds. A die-cast molding machine formed by an injection device including an injection sleeve for injecting and filling molten metal into a cavity, wherein the common base is inclined at a constant inclination angle in the range of 5 ° to 75 ° with respect to the horizontal. And the injection sleeve is fitted to the front end of a cylindrical docking frame that is arranged to move forward and backward in front of an injection cylinder that can tilt between a vertical state and the tilt angle, and A die-cast molding machine, wherein a plunger tip connected to a piston rod of the injection cylinder is fitted in the injection sleeve so as to be movable back and forth. 2. A mold device equipped with a pair of left and right molds or a pair of upper and lower molds that are loaded on a common base and can be opened and closed, a mold clamping device for the mold, and a mold formed by both molds. A die-cast molding machine formed by an injection device including an injection sleeve for injecting and filling molten metal into a cavity, wherein the common base is tiltable from a horizontal state to an inclination angle of 50 ° with respect to the horizontal state. The injection sleeve is provided with a tilting means, and the injection sleeve is fitted to a front end portion of a cylindrical docking frame that is arranged to be movable forward and backward in front of an injection cylinder that is tiltable between a vertical state and the tilt angle, and A die-cast molding machine, wherein a plunger tip connected to a piston rod of the injection cylinder is fitted in the injection sleeve so as to be movable back and forth. 3. The die-cast molding machine according to claim 2, wherein the tilting means of the common base is a hydraulic cylinder or an electric motor for rotating the common base around a horizontal center of gravity axis attached to the common base. . 4. The die-cast molding machine according to claim 1, wherein the tilting means of the injection cylinder is a hydraulic cylinder or an electric motor.