JP3480875B2 - Die casting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting apparatus, and in particular, a pressurizing element is provided in a runner following a cavity formed by a fixed die and a movable die so as to be capable of advancing and retreating toward the spout of the cavity. The present invention relates to a die casting apparatus in which a molten metal inlet is formed in the middle of a road, the molten metal is supplied into the cavity from the molten metal inlet, and then a pressurizer is advanced to pressurize the molten metal in the cavity.

[0002]

[Technical background] When performing this type of die casting, the molten metal is supplied to the cavity while keeping the temperature of the molten metal so that it does not solidify before the molten metal is supplied to the cavity and pressurized by the pressurizer. It is necessary to devise so as not to clog the part from the hot water supply port of the means to the sprue part of the cavity.

[0003]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 1-299752, etc., it is necessary to keep the molten metal supplied in the cavity so that it does not solidify before being pressurized by a pressurizer. This is solved by applying a powdery heat insulating agent to the surface of the. Further, as a measure for preventing the supplied molten metal from being clogged at the portion from the molten metal supply port of the molten metal supply means to the molten metal spout part, the applicant of the present application previously proposed a casting mold apparatus as shown in FIG. It proposed (see Japanese Patent real-Open No. 6-15860).

In the previously proposed mold device, the hot water supply port of the molten metal supply means b is connected to the back side of the fixed mold a, and the outlet b'of the hot water supply port and the sprue part d of the cavity c are joined to the mold matching surface part e. To communicate with the solidified product forming runner f formed in the above, to pressurize and pressurize the pressurizer g, and then solidify the molten metal remaining near the outlet b ′ of the hot water supply port or in the solidified product forming runner f. By this, the clogging of the molten metal at the relevant portion is prevented.

However, in this casting mold apparatus, the regular product h cast in the cavity and the solidified product i which is not the product formed by the solidified product forming runner f are simultaneously advanced. It will be cast. Therefore, when the molten metal in the cavity is pressed, the product h is crushed by the heat-insulating layer of the powdery heat insulating agent and the molten metal comes into contact with the mold, so that it solidifies in a short time as in normal die casting. Since the pressure is not applied to the solidified product i from the original, the cooling rate becomes slow because the heat insulating layer formed by the powdery heat insulating agent remains formed between the mold and the molten metal. Hot water outlet b '
Since it is in the vicinity of and is higher in temperature than other parts, it takes time to solidify, and as a result, the timing of mold opening is the solidified product i.
However, there was a problem that the casting cycle was lengthened by the solidification time and the productivity was worse than that of ordinary die casting.

Moreover, in the previously proposed casting mold apparatus, the structure for connecting the hot water supply port b of the molten metal supply means and the solidified product forming runner f must be formed for each mold. However, there was a problem that the manufacturing and processing cost of the mold was increased accordingly.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can reliably prevent clogging of the molten metal at a portion from the molten metal supply port of the molten metal supply means to the spout of the cavity. The present invention is to provide a die-casting casting device that can accelerate the casting cycle as compared with the conventional one and can reduce the manufacturing processing cost of the mold.

[0008]

The die casting apparatus of the present invention that achieves the above object is capable of advancing and retracting a pressurizing element toward a sprue part of a cavity in a runner continuing to a cavity formed by a fixed die and a movable die. A die-casting casting apparatus, in which a molten metal inlet is formed in the middle of the runway, the molten metal is supplied from the molten metal inlet into the cavity, and then the pressurizer is advanced to pressurize the molten metal in the cavity. In addition, an auxiliary mold is arranged on the peripheral end surface of the fixed mold, and the runner leading to the cavity and the molten metal inlet are formed in the auxiliary mold, and the metal solidification is actively performed near the molten metal inlet. It is characterized by creating things. At this time, it is preferable that the auxiliary mold is composed of a pair of an auxiliary fixed mold and an auxiliary movable mold, and the auxiliary movable mold can open and close the mold independently of the movable mold. Further, a hot water supply passage is formed in the auxiliary fixed die from the rear surface side to the mold matching surface portion, the hot water supply port of the molten metal supply means is connected to the inlet of the hot water supply passage, and the outlet of the hot water supply passage and the molten metal inlet are subsidized. A metal solidified product may be produced from the vicinity of the outlet of the hot water supply passage to the molten metal inlet by communicating with the solidified product production runner formed on the mold matching surface portion. In that case, it is preferable that the cooling element is inserted into the solidified product forming runner so as to be detachable from the vicinity of the outlet of the hot water supply passage along the longitudinal direction of the solidified product forming runner. Further, a molten metal inlet is formed on the back side of the auxiliary fixed die, the molten metal inlet of the molten metal supply means is directly connected to the auxiliary fixed die, and the molten metal inlet is provided on the mating surface side of the auxiliary fixed die. To form a solidified product outlet, the solidified product outlet is opened and closed by an auxiliary movable type, and a metal solidified product is generated from the molten metal inlet to the solidified product outlet, and the solidified metal is solidified. You may make it pull out and remove from a pick-up port. At this time, a recess is formed in the auxiliary movable die for forming a tensile portion on the metal solidified product generated from the molten metal inflow port to the solidified product extraction port, and a hooking pin protruding and retracted is provided in the recess. It is preferable to dispose an extruding pin for extruding the metal solidified product from the recess. Further, it is preferable that a pressurizing sleeve for inserting the pressurizer is disposed in the runner continuing from the cavity, and the inner diameter of the pressurizing sleeve is formed to be smaller than the sprue diameter of the cavity.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described with reference to FIG.
5 is described with reference to the drawings shown in FIG. 5, but the present invention is not limited to the embodiments.

This die casting apparatus basically comprises a die (fixed die 1 and movable die 2) for casting a product,
Auxiliary molds (auxiliary fixed mold 3 and auxiliary movable mold 4) for casting the metal solidified product G which is disposed on the peripheral end surface of the fixed mold 1 and does not become a product, and a known one for opening and closing the movable mold 2. Mechanism (not shown), molten metal supply means (for example, molten metal supply pipe) 6 for supplying molten metal into the cavity 5 formed by the fixed die 1 and the movable die 2, and a runner continuing to the cavity 5. A pressurizer 8 which is arranged so as to be capable of advancing and retracting toward the sprue part 7 of the cavity 5 and pressurizes the molten metal in the cavity 5, a pressurizing cylinder 9 for operating the pressurizer 8, and the metal solidified product. It is composed of a cooling element 10 for rapidly cooling G, a driving cylinder 11 for operating the cooling element 10, and the like. In the figure, 13 is a fixed plate for mounting the fixed mold 1, and 14 is a movable plate for mounting the movable mold.

In this embodiment, the runner continuing to the cavity 5 is exposed to the sprue 7 of the cavity 5 and the pressure sleeve 1 is used.
2 is arranged, and the pressurizer 8 is slidably inserted into the pressurizing sleeve 12, but the pressurizer 8 is slidably inserted into the runner continuing to the cavity 5 without using the pressurizing sleeve 12. It may be movably arranged. That is, it should be understood that the pressure sleeve 12 is not essential for casting the product, and the runner (part of) the cavity 5 and the pressure sleeve 12 are substantially the same. is there.

The auxiliary mold is composed of at least the auxiliary fixed mold 3, and the auxiliary movable mold 4 for casting the metal solidified material G in cooperation with the auxiliary fixed mold 3 is also used as the movable mold 2 for casting the product. However, the illustrated embodiment is composed of an auxiliary fixed die 3 and an auxiliary movable die 4 capable of opening and closing the die independently of the movable die 2.

At least one set of the auxiliary molds is arranged on the peripheral end face of the fixed mold 1, that is, the upper and lower end faces and the left and right end faces so as to be separable. In the case of the illustrated embodiment, the auxiliary fixed die 3 is attached to the tie bar 1.
5, the auxiliary die 5 is attached to the auxiliary fixed die 3 such that the auxiliary movable die 4 can be freely opened.

Further, the auxiliary movable die 4 which constitutes the auxiliary die
Is an opening / closing cylinder 1 on the die matching surface 3a side of the auxiliary die.
7 and the guide rod 18 so that the mold can be opened / closed in the mold opening direction so that the opening / closing operation of the mold can be performed independently of the movable mold 2 by the operation of the opening / closing cylinder 17.

The auxiliary fixed mold 3 and the auxiliary movable mold 4 do not need to be matched with each other on their entire surfaces, and as shown in the illustrated embodiment, only the parts 3'and 4'for producing and casting the metal solidified product G are mutually formed. It suffices if the molds are matched, and the mold matching portion 3 ′,
A runner leading to the cavity 5 is formed in 4 ', and the pressure sleeve 12 is installed in the runner.

On the other hand, a pressurizing cylinder 9 is attached to the lower part of the auxiliary fixed die 3 via a bracket 19, and the pressurizer 8 is connected to the pressurizing cylinder 9 so that the pressurizer 8 is connected to the cavity 5.
It is slidably fitted into a pressure sleeve 12 arranged so as to face the sprue part 7.

The pressure sleeve 12 has a flange 12 at the upper end.
It is formed in a substantially cylindrical shape having a and has an opening 12 on the upper end side.
b to face the spout 7 of the cavity 5 and the auxiliary fixed mold 3
In addition, the molten metal inlet 20 is formed at a position corresponding to the solidified material producing runway 23 formed on the die matching surface portion 3a of the auxiliary mold. At this time, the molten metal inlet 20
It is preferable that the opening is formed at a quarter or more of the circumference of the pressure sleeve 12 so that the solidified product solidified inside can be taken out. The sprue part 7 of the cavity 5 is formed on the mold (fixed mold 1, movable mold 2) side, and is formed on the mold matching surface part 3a of the auxiliary mold (auxiliary fixed mold 3, auxiliary movable mold 4). And the opening 12b of the pressurizing sleeve 12.

The flange 12 of the pressure sleeve 12
a is made to slightly project from the upper end surface of the auxiliary fixed die 3, and the upper surface on the auxiliary movable die 4 side is formed to have a gentle inclination so that it also serves as a guide when the movable die 2 is matched. As a result, the precision of die matching between the fixed die 1 and the movable die 2 is further improved.

Further, the pressurizer 8 is formed in a hollow structure having an inlet 22a and an outlet 22b of the cooling water so that the cooling water can be circulated and circulated inside the pressurizer 8 and the gate 7 of the cavity 5 can be formed. The inner diameter of the pressure sleeve 12 is slightly smaller than the diameter of the sprue 7 of the cavity 5 so that the molten metal exists in a thin film between the inner circumference of the sprue 7 of the cavity 5 and the outer circumference of the pressurizer 8 when entering the inside. To form. When the pressure sleeve 12 is not used, the outer diameter of the pressurizer 8 arranged in the runner following the cavity 5 is formed to be slightly smaller than the diameter of the sprue 7 of the cavity 5. At this time, the sprue part 7
A gap between the inner circumference and the outer circumference of the pressurizer 8, that is, the thickness of the substantially cylindrical solidified product formed by the inner circumference of the sprue part 7 and the outer circumference of the pressurizer 8 is preferably about 1 to 3 mm, It is preferable to form a thin portion having a thickness of 1 mm or less in the axial direction, instead of forming a uniform thickness over the entire circumference of the pressurizer 8. Then, when the pressurizer 8 descends and retreats, it is possible to reduce the resistance force that the molten metal clinging to the outer periphery of the pressurizer 8 solidifies and contracts to work.

Further, the auxiliary fixed die 3 of the auxiliary die has a hot water supply passage 24 formed in a penetrating manner from the back surface side 3b to the mold matching surface portion 3a, and a molten metal supply means (for example, molten metal supply) is provided at an inlet 24a of the hot water supply passage 24. Pipe) 6 hot water supply port 6a
And the outlet 24b of the hot water supply passage 24 and the molten metal inlet 20 of the pressurizing sleeve 12 are connected to each other by the mold matching surface portion 3
The runner 23 for forming a solidified product formed in a is used for communication.

The hot water supply passage 24 is formed so as to be parallel to the mold opening / closing direction of the auxiliary mold. At this time, the molten metal is formed as short as possible so that the molten metal does not solidify and clog inside, and the molten metal solidified near the outlet 24b smoothly escapes from the inlet 24a to the outlet 24b. It is preferably formed into a shape. Further, the inlet 24a of the hot water supply passage 24 is formed in a substantially concave spherical seat shape, and the hot water supply port 6a of the molten metal supply means 6 formed in a pipe shape is also formed in a spherical abutment shape, so that the hot water supply passage 24 The hot water inlet 6a of the molten metal supply means 6 is connected to the inlet 24a with a heat resistant packing interposed therebetween.

The runway 23 for producing a solidified product is formed by the molten metal supply means 6
Is a portion for guiding the molten metal supplied from the hot water supply port 6a of the mold to the cavity 5 and at the same time solidifying the excess molten metal that has exited from the outlet 24b of the hot water supply passage 24 and has not been able to enter the gate part 7 of the mold cavity 5. , Outlet 24b of hot water supply passage 24
And the molten metal inflow port 20 of the pressure sleeve 12 are formed in a groove shape on the die matching surface portion 3a of the auxiliary die.

Then, in the runway 23 for producing the solidified product,
The cooling element 10 for rapidly solidifying the molten metal remaining in the solidified material producing runway 23 is inserted and removed freely. That is, the drive cylinder 11 attached to the end portion of the auxiliary movable die 4 via the attachment plate 25 on the extension line of the hot water supply passage 24 along the longitudinal direction of the solidified product generation runway 23 on the outlet 24b side.
The cooling element 10 is connected to the driving cylinder 11, and the cooling element 10 extends from the vicinity of the outlet 24b of the hot water supply passage 24 to the vicinity of the molten metal inlet 20 of the pressurizing sleeve 12 in the longitudinal direction of the solidified product forming runway 23. Insert and remove freely along the direction.

The cooling element 10 is formed to have a required length by using a hollow pipe material, and the cooling water inlet 10a and the outlet 1 are provided so that the cooling water can be circulated and circulated inside the cooling element to be cooled.
It is formed in a double pipe structure having a base 10c having 0b on one end side.

Incidentally, reference numeral 26 in the drawing denotes an extruding pin for surely extruding the metal solidified product G cast in the solidified product forming runner 23 out of the mold, which is attached to the outside of the auxiliary movable mold 4. It is connected to the push-out cylinder 27 and moves forward and backward.

When a product is cast by using the die casting apparatus, the powdery heat insulating agent is first powdered in the cavity 5, the sprue part 7 thereof, and the runner 23 of the auxiliary mold for producing a solidified product. Electrostatically applied as it is.

Then, the mold clamping mechanism is operated to close the mold (fixed mold 1, movable mold 2), and at the same time, the opening / closing cylinder 17 is operated to operate the auxiliary mold (auxiliary fixed mold 3, auxiliary movable mold 4). ) Is closed, and the pressure element 8 is fixed to the pressure sleeve 12.
The cooling element 10 is made to stand by near the lower portion of the molten metal inlet 20, and the cooling element 10 is made to stand by near the outlet 24b of the hot water supply passage 24.

After that, the inside of the cavity 5 is depressurized or the holding furnace (not shown) is pressurized, and the molten metal is supplied from the molten metal supply port 6a to the auxiliary fixing die 3 through the molten metal supply means 6 connected to the holding furnace. It is led to the hot water supply passage inlet 24a, and is made to flow from the hot water supply passage 24 to the outlet 24b of the hot water supply passage 24 → the solidified material generation runway 23 → the molten metal inlet 20 of the pressure sleeve 12 → the pressure sleeve 12 → the sprue part 7, The cavity 5 is filled with the molten metal.

Next, the pressurizing cylinder 9 is operated to move the pressurizer 8 upward to the sprue 7 side of the cavity 5. Then, the molten metal inlet 20 formed in the pressure sleeve 12 is opened.
Is closed by the pressurizer 8, and at the same time as the pressurizer 8 moves upward, the molten metal in the cavity 5 is pressurized through the molten metal in the sprue part 7, and in that state the molten metal in the cavity 5 is pressed. Is solidified and the product is cast.

On the other hand, the supply of molten metal from the molten metal supply means 6 is stopped at the timing when the pressurizing element 8 closes the molten metal inlet 20 of the pressing sleeve 12, and the driving cylinder 11 is operated to operate the cooling element 10. The exit 2 of the hot water supply passage 24
4b from the side near 4b to the vicinity of the molten metal inlet 20 of the pressure sleeve 12 along the longitudinal direction of the solidified product forming runner 23. Then, the molten metal remaining in the solidified material forming runway 23 from the outlet 24b of the hot water supply passage 24 to the molten metal inlet 20 of the pressure sleeve 12 is forcibly cooled and rapidly solidified to form the metallic solidified material G. Cast.

Thus, after the pressurizer 8 is lowered and retracted to the original position, the movable mold 4 is operated to open the mold, and at the same time as or immediately before or after the product cast in the cavity 5 is taken out, the opening and closing is performed. The cylinder 17 is operated to open the auxiliary movable die 4 to separate the metal solidified material G from the solidified material producing runner 23 of the auxiliary fixed die 3, and finally, the driving cylinder 1
When the cooling element 10 is pulled out from the metal solidified material G by operating 1 (FIG. 5), the metal solidified material G is separated from the auxiliary movable die 4 (FIG. 5).
reference).

At this time, if the metal solidified product G is not separated from the auxiliary movable die 4 even if the cooling element 10 is pulled out from the metal solidified product G, the extrusion cylinder 27 is operated to force the metal by the extrusion pin 26. The solidified material G is separated from the auxiliary movable die 4. After that, repeat this operation,
Cast the product.

Next, a die cast casting apparatus according to a second embodiment of the present invention will be described with reference to the drawings shown in FIGS. 6 to 11. The same construction as the die cast casting apparatus according to the first embodiment described above. The same reference numerals are given to the members, duplicated description will be omitted, and different configurations will be described.

In this die casting apparatus, the molten metal inlet 20 of the pressure sleeve 12 attached to the auxiliary fixed die 3 is directly connected to the molten metal inlet 6a of the molten metal supply means (for example, molten metal supply pipe) 6 and the pressing sleeve 12 is used. Ni melt inlet 2
The solidified product outlet 30 is formed so as to face 0, and the solidified product outlet 30 through the molten metal inlet 20 or the auxiliary movable die 4
The metal coagulated product G produced over the above is drawn out from the coagulated product take-out port 30 and eliminated.

That is, the solidified product outlet 30 is formed in the pressure sleeve 12 at a position facing the molten metal inlet 20, and the solidified product outlet 30 is opened and closed by the mold matching portion 4'of the auxiliary movable mold 4. At the time of casting of the product, the metal solidified material G generated from the molten metal inlet 20 to the solidified material outlet 30 or the mold matching portion 4'of the auxiliary movable die 4 is drawn out from the solidified material outlet 30 and discharged. It is a thing.

The mold matching portion 4'of the auxiliary movable mold 4 is a contact surface 4 with the solidified product outlet 30 formed on the pressure sleeve 12.
a is formed flat (smooth), and a metal solidified product G is formed on the surface of the pressure sleeve 12 facing the molten metal inlet 20.
A concave portion or a convex portion (a concave portion in the illustrated example) 31 for forming the pulling portion G ′ is formed on the.

Also, the mold matching portion 4'of the auxiliary movable mold 4 is used.
In order to pull out the metal solidified product G from the solidified product take-out port 30 through the pulled portion G ′ and discharge it, a hooking pin 33 and an extruding pin 34 are incorporated and arranged.

The hooking pin 33 is incorporated and disposed so as to be able to project and retract in the recess 31 of the auxiliary movable die 4. Specifically, the two hooking pins 33, 33 are attached to the auxiliary movable mold 4 so that they can appear in and out of the recess 31 of the auxiliary movable mold 4.
The left and right sides of the hook rods 33 and 33 are incorporated into the recess 31 so as to be retractable and retractable, and the hooking pins 33 and 33 are inclined rods 35 and 35.
The slide pieces 36, 36 slidably connected to each other are attached so as to be movable and adjustable. At this time, 2
The tilted rods 35, 35 of the book are arranged on the auxiliary fixed mold 3 so as to open slightly to the left and right toward the mold opening direction of the auxiliary mold.

The extruding pin 34 is attached to an extruding plate 39 movably arranged in the auxiliary movable die 4 via a return pin 37 and a positioning pin 38 in the die opening direction of the auxiliary die, and its tip portion is attached. The top of the pulling portion G ′ of the metal solidified substance G is disposed in the recess 31 of the auxiliary movable die 4 so as to be pressed.

The mechanical structure for operating the hooking pin 33 and the push-out pin 34 is not limited to that of the illustrated embodiment. For example, one hooking pin 33 may be used, and hydraulic pressure or hydraulic pressure may be used. It may be operated by an air cylinder, and the push pin 34 may be operated by hydraulic pressure or an air cylinder.

A molten metal return passage 40 is formed on the inner peripheral surface of the pressure sleeve 12 so that a part of the molten metal can return to the molten metal inlet 20 while the pressure element 8 is being pressed forward. At this time,
The depth of the molten metal return passage 40 is cooled by contacting the side surface of the pressurizer 8 with the molten metal present in the molten metal return passage 40 during the pressurization and advance of the pressurizer 8, and the solid-liquid coexisting state (solid The volume ratio is set to 1 to 99%), and the distance (L) from the upper end of the molten metal return passage 40 to the upper end surface of the flange 12a of the pressure sleeve 12 is set.
Is adjusted to the pressurization volume of the smallest product to be cast, and when the volume of the product to be cast is small, the pressurization advance speed of the pressurizer 8 is increased to increase the molten metal in the molten metal return passage 40. To lower the solid phase ratio so that the viscosity does not rise,
When the volume of the product to be cast is large, the pressurizing advancing speed of the pressurizer 8 is increased so that the pressurizing advancing speed of the pressurizer 8 is slowed to increase the solid fraction of the molten metal in the molten metal return passage 40 to increase the viscosity. It is preferable that the solid phase ratio of the molten metal in the molten metal return passage 40 be adjusted by changing the value in accordance with the volume of the product to be cast.

Then, when the pressurizer 8 is moved up toward the sprue 7 side of the cavity 5, a part of the melt in the pressurizing sleeve 5 passes through the melt return passage 40 and the melt inlet 2
0, and after the tip of the pressurizer 8 has passed the upper end of the molten metal return passage 40, the cavity 5 is passed through the molten metal in the sprue part 7.
Pressure is applied to the molten metal inside to cast a proper product. That is, when the volume of the product to be cast is small and the pressurizing volume at the time of casting is small, when the pressurizer 8 pushes up the molten metal in the sprue part 7, relatively high pressure is applied to the molten metal from the initial stage, and the molten metal is Through the molten metal return passage 40, the molten metal inlet 20
Therefore, the molten metal in the cavity 5 is not pressurized more than the resistance of the molten metal return, and the molten metal until the pressurizer 8 passes the upper end surface of the flange 12a of the pressure sleeve 12 is set as the pressurized volume of the cast product. Therefore, as a result, the tip portion of the pressurizer 8 can be reliably advanced to a position above the upper end of the flange 12a of the pressurizing sleeve 12, and conversely, the volume of the product to be cast is large and the pressurizing volume at the time of casting is large. If it is large, presser 8
Since the pressure received by the molten metal during the advancing of the molten metal does not become large even if the pressurizer 8 considerably advances, most of the molten metal present in the molten metal return passage 40 does not return to the molten metal inlet 20 and flows from the spout 7 into the cavity 5. That is, it is possible to sufficiently supply the molten metal corresponding to the volume change during casting. Such control can be made more delicately by changing the pressurizing forward speed of the pressurizer 8 according to the volume of the product to be cast and adjusting the solid phase ratio of the molten metal in the molten metal return passage 40. .

Therefore, it is possible to always set the final advancement position of the pressurizer to a position above the upper end face of the flange of the pressure sleeve and below the advancement limit of the pressurizer regardless of the change in volume of the product to be cast. Therefore, regardless of the volume of the product to be cast, it is possible to sufficiently supply and pressurize the molten metal for the volume change at the time of casting, and to add pressure without changing the pressurizer and the pressure sleeve according to the volume of the product to be cast. Since the tip portion of the indenter can surely reach the position above the upper end of the flange of the pressure sleeve, it is possible to prevent a part of the cast product from being inside the pressure sleeve and being unable to be taken out from the cavity.

When a product is cast using the die casting apparatus, the cavity 5 and the sprue 7 are electrostatically coated with a powdery heat insulating agent, and then the die (fixed die 1, movable die 2). ) And the auxiliary mold (auxiliary fixed mold 3, auxiliary movable mold 4) are closed, and the solidified product outlet 30 is closed by the mold matching portion 4 ′ of the auxiliary movable mold 4, and the recess 31 of the auxiliary movable mold 4 is closed. The push pin 34 is faced inside and the hook pin 33 is projected. After that, the molten metal is directly introduced into the pressure sleeve 12 through the molten metal inlet 6a of the molten metal supply means 6 through the molten metal inlet 20 of the pressure sleeve 12, and the molten metal is introduced from the spout portion 7 into the cavity 5
Fill the inside with molten metal. When the pressurizing cylinder 9 is operated to raise the pressurizer 8 toward the gate 7 side of the cavity 5, the molten metal in the cavity 5 passes through the melt in the gate 7 as the pressurizer 8 rises. Pressurized, the molten metal in the cavity 5 is solidified in that state, and the product is cast.

At this time, the molten metal also fills the recess 31 of the auxiliary movable die 4 that opens and closes the solidified material outlet 30, and the hooking pin 3 that has been made to project into the recess 31 of the auxiliary movable die 4 in advance.
The molten metal also wraps around the outer periphery of 3, and as a result, the pressurizer 8 rises, and then the pulling portion G ′ extends from the molten metal inlet 20 to the solidified product outlet 30 or the recess 31 of the auxiliary movable die 4 in the pressure sleeve 12. A metal solidified product G having γ is generated.

In the figure, reference numeral 41 is a cooling water passage for cooling the pressure sleeve 12, and reference numeral 42 in FIG. 11 showing the appearance of the solidified metal G is the molten metal return passage 40 described above. G'is a portion formed at the molten metal inlet 20, 43 is a hole penetrated by the pressurizer 8, and G'is a concave portion 31 of the auxiliary movable die 4 and is the same as the metal solidified substance G. An integrally formed pulling portion 44 is a recessed portion showing a trace that the hooking pin 33 is engaged.

Thus, after the pressurizer 8 is lowered and retracted to the initial standby position, the mold (fixed mold 2, movable mold 4) is opened to take out the cast product from the cavity 5, and the auxiliary mold (auxiliary fixing). When the mold 3 and the auxiliary movable mold 4) are opened,
Hooking pin 3 generated in the recess 31 of the auxiliary movable die 4
The pulling part G'in the state of being caught on 3, 33 is
Along with the mold opening operation of the auxiliary movable die 4, the auxiliary movable die 4 moves to the same body as the auxiliary movable die 4, and the metal solidified material G is pulled out from the solidified material outlet 30 of the pressure sleeve 12. On the other hand, auxiliary movable type 4
The slide pieces 36, 36 slide along the inclined rods 35, 35 in accordance with the mold opening operation, and the hooking pins 33, 33 attached to the slide pieces 36, 36 move to the left and right outer sides, respectively. The tip portion is retracted from the recess 31 of the auxiliary movable die 4 and is disengaged from the tension portion G ′ (see FIG. 9).

Then, when the mold opening operation of the auxiliary movable die 4 further progresses, the push-out plate 39 of the push-out pin 34 abuts on the abutment plate 45 attached to the tips of the two inclined rods 35, 35, and the push-out plate is pushed. 39 relatively moves to the auxiliary movable die 4 side.
Then, the extrusion pin 34 projects into the concave portion 31 of the auxiliary movable die 4 and presses the crown of the pulling portion G ′, and the metal solidified material G
Is ejected by being pushed down from the recess 31 of the auxiliary movable die 4 (see FIG. 10). After that, when the auxiliary movable die 4 is closed, the tip of the return pin 37 comes into contact with the auxiliary fixed die 3 to return the pushing plate 39 to the initial position, and as a result, the pushing pin 34 is also returned to the initial position. . Hereinafter, this operation is repeated to cast the product.

[0049]

As described above, the die casting apparatus of the present invention is
Since the mold part for casting the product and the structure part for supplying and filling the molten metal into the cavity of the mold, that is, the part of the auxiliary mold for producing the metal solidified product which does not become the product, are configured independently, It is possible to make the mold parts common, so that the manufacturing and processing cost of the mold can be reduced as compared with the conventional one.

Moreover, according to the die casting apparatus of the second aspect of the present invention, the die opening operation of the die and the die opening operation of the auxiliary die can be performed independently of each other. It is possible to open the mold without being pulled during the solidification time of the solidified metal that takes longer to solidify than the product cast by the mold, and the casting cycle can be shortened accordingly.

Further, according to the die casting apparatus of the third aspect of the present invention, the portion near the molten metal inlet, more specifically, the portion from the outlet portion of the hot water supply passage to the molten metal inlet of the pressurizing sleeve (in the runway for solidified matter generation) Since the molten metal remaining in () can be positively solidified and removed as a metal solidified product, clogging of the molten metal at the relevant portion can be reliably prevented.

Further, according to the die casting apparatus of the fourth aspect of the present invention, the solidified metal produced in the auxiliary mold can be solidified rapidly, and the casting cycle can be further shortened. Becomes

Further, according to the die casting apparatus of claim 5 of the present invention, the distance that the molten metal flows from the molten metal supply port of the molten metal supply means to the cavity can be further shortened. It is possible to reduce the temperature drop and the temperature variation. Moreover, since it is possible to reduce the metal solidified product that does not become a product,
The yield of casting can be improved.

Further, according to the die casting apparatus of the seventh aspect of the present invention, the metal solidified matter generated in the pressure sleeve can be surely and easily discharged from the solidified matter outlet.

Further, according to the die casting apparatus of claim 8 of the present invention, even if the solidified product outlet of the auxiliary movable die or the pressure sleeve is slightly distorted due to thermal expansion, the solidified material of the auxiliary movable die and the pressure sleeve is solidified. It is possible to prevent a large gap from being generated on the contact surface with the outlet, and to reliably prevent the molten metal from leaking from the contact surface.

Further, according to the die casting apparatus of the tenth or the eleventh aspect of the present invention, when the pressurizer enters the sprue part of the cavity, the molten metal forms a thin film between the inner circumference of the sprue part of the cavity and the outer circumference of the pressurizer. Since the molten metal in the cavity cannot be sufficiently pressurized, it is possible to prevent the problem from occurring.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is an enlarged cross-sectional view showing a main part in FIG.

FIG. 4 is a sectional view taken along line (4)-(4) of FIG.

5 is a cross-sectional view showing a state where the auxiliary movable die is opened from the state shown in FIG.

FIG. 6 is a side view showing a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view taken along line (7)-(7) of FIG.

FIG. 8 is an enlarged cross-sectional view taken along line (8)-(8) of FIG.

9 is a cross-sectional view showing a state where the auxiliary movable die is opened from the state shown in FIG.

10 is a sectional view showing a state in which the auxiliary movable die is further opened from the state shown in FIG.

FIG. 11 is an external perspective view of a solidified metal product generated in the pressure sleeve.

FIG. 12 is a partially cutaway front view illustrating a conventional example.

[Explanation of symbols]

1: Fixed type 2: Movable type 3: Auxiliary fixed type 4: Auxiliary movable type 5: Cavity 6: Molten metal supply means 6a: Hot water supply port 7: Gate part 8: Pressurizer 9: Pressurizing cylinder 10: Cooler 11: Drive Cylinder 12: Pressurizing sleeve 17: Opening / closing cylinder 20: Molten metal inflow port 23: Solidified product generation runner 24: Hot water supply passage 24a: Hot water supply passage inlet 24b: Hot water supply passage outlet 26: Extrusion pin 27: Extrusion cylinder 30 : Solidified product outlet 31: Recessed portion 33: Hooking pin 34: Extrusion pin 35: Inclined rod 36: Sliding piece 37: Return pin 38: Positioning pin 39: Extrusion plate 40: Molten metal return passage G: Metal solidified substance G ': Pulling Department

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B22D 17 / 20,17 / 22 B22C 9/06

Claims (11)

(57) [Claims] 1. A pressurizing element is provided in a runner which follows a cavity formed by a fixed mold and a movable mold so as to be able to move back and forth toward the gate of the cavity, and a melt inlet is formed in the middle of the runner. A die-cast casting apparatus configured to press the molten metal in the cavity by advancing the pressurizer after supplying the molten metal from the inlet to the cavity, and arranging an auxiliary mold on the peripheral end surface of the fixed mold. , The auxiliary mold is made to form a runner and a molten metal inflow port continuing to the cavity,
A die-casting apparatus characterized in that a metal solidified product is produced near the molten metal inlet. 2. The auxiliary mold is composed of a pair of auxiliary fixed mold and auxiliary movable mold, and the auxiliary movable mold is configured to open and close the mold independently of the movable mold. The die casting apparatus according to claim 1. 3. An auxiliary fixed die of the auxiliary die is formed with a hot water supply passage extending from the rear surface thereof to the mating surface portion, and a hot water supply port of a molten metal supply means is connected to an inlet of the hot water supply passage and an outlet of the hot water supply passage. The molten metal inlet is connected to the molten metal inflow passage formed in the mating surface portion of the auxiliary mold to generate a metallic solidified substance from the vicinity of the outlet of the hot water supply passage to the molten metal inlet. The die casting apparatus according to claim 1, characterized in that. 4. A cooler is inserted into the solidified product forming runner so as to be freely inserted into and removed from the vicinity of the outlet of the hot water supply passage along the longitudinal direction of the solidified product forming runner. Item 3. The die casting apparatus according to item 3. 5. The molten metal inlet is formed on the back side of the auxiliary fixed die of the auxiliary mold, and the molten metal inlet is directly connected to the molten metal inlet of the molten metal supplying means, and the auxiliary mating surface side of the auxiliary fixed die. Is formed with a solidified product outlet facing the molten metal inlet, and the solidified product outlet can be opened and closed by an auxiliary movable die of the auxiliary mold, and a metal is extended from the molten metal inlet to the solidified product outlet. The die casting apparatus according to claim 1, wherein a solidified product is generated and the metal solidified product is pulled out from the solidified product take-out port. 6. A concave or convex portion is formed on the auxiliary movable die for forming a tensile portion on the metal solidified product generated from the molten metal inlet to the solidified product outlet. The described die casting apparatus. 7. The auxiliary movable die is provided with a hooking pin projecting and retracting in the recess and an extruding pin for pushing the metal solidified product out of the recess. The die casting apparatus according to claim 6. 8. The die casting apparatus according to claim 5, wherein the contact surfaces of the auxiliary movable die and the solidified product outlet are formed flat. 9. A pressurizing sleeve for fitting the pressurizer therein is disposed in a runner continuing from the cavity, and the molten metal inlet is formed in the middle of the pressurizing sleeve. The die casting apparatus according to claim 1, 3 or 5. 10. The die casting apparatus according to claim 1, wherein the outer diameter of the presser is smaller than the sprue diameter of the cavity. 11. The die casting apparatus according to claim 9, wherein the pressure sleeve has an inner diameter smaller than a sprue diameter of the cavity.