JP4472486B2 - Molding device - Google Patents

Description

  The present invention relates to a molding apparatus for molding various products in a cavity.

  A conventional molding apparatus shown in FIG. 9 has been proposed. This molding apparatus includes a lower mold unit 111 and an upper mold unit 112. Support rods 115 are provided at a plurality of positions on the upper surface of the horizontal support plate 113 of the lower mold unit 111 via a plurality of mounting cylinders 114. It is installed. A lower mold gripping body 116 is mounted on each support rod 115 so as to be movable up and down. A coil spring 117 is interposed between the mounting cylinder 114 and the lower mold gripping body 116, and urges the lower mold gripping body 116 to always float upward. A lower die 118 is fitted and fixed to the center of the upper surface of the lower die holding body 116. The upper mold holding body 119 constituting the upper mold unit 112 is moved up and down by a lifting mechanism (not shown), and the upper mold 120 is attached to the center of the upper mold holding body 119. A cavity 121 is formed between the lower mold 118 and the upper mold 120 when the lower mold holding body 116 and the upper mold holding body 119 shown in FIG. A storage chamber 122 is formed at the center of the lower mold holding body 116 and the lower mold 118, and an extrusion rod 123 erected on the upper surface of the horizontal support plate 113 is inserted into the storage chamber 122 from below. ing.

As shown in FIG. 9, in the mold open state where the upper mold unit 112 is spaced upward from the lower mold unit 111, molten metal is injected into the storage chamber 122, and the upper mold unit 112 is moved downward. As shown in FIG. 11, the lower surface of the upper mold gripper 119 is brought into contact with the upper surfaces of the lower mold gripper 116 and the lower mold 118. In this state, the air in the cavity 121 formed by the lower mold 118 and the upper mold 120 is sucked outside by using the pressure reducing passage 119a formed in the upper mold gripping body 119, and the inside of the cavity 121 is decompressed. To do. Further, in FIG. 10, the upper mold unit 112 is moved downward, and the lower mold unit 111 is moved downward against the elastic force of the coil spring 117. By the downward movement of the lower mold gripping body 116 and the upper mold gripping body 119, the push rod 123 is relatively moved into the storage chamber 122, and the molten metal in the storage chamber 122 is pushed into the cavity 121, As shown in FIG. 11, a product having a predetermined shape is molded in the cavity 121. (See Patent Document 1)
JP 2004-230386 A

  However, in the above-described conventional molding apparatus, since the lower mold body 116 of the lower mold unit 111 is lifted and held upward by the coil spring 117, the upper surface of the lower mold body 116 is placed on the upper surface as shown in FIG. The following problems may occur in the process of pouring the molten metal into the cavity where both the lower mold gripper 116 and the upper mold gripper 119 move downward from the mold closed state in which the lower surface of the upper mold gripper 119 is in contact. There was sex. That is, since the pressing force of the contact interface of the upper surface of the lower mold gripper 116 with respect to the lower surface of the upper mold gripper 119 is set by the coil spring 117, the contact pressure of the mold matching surface is not always appropriate. When the pressing force by the coil spring 117 is weakened, the molten metal may leak from the mold matching surface.

  An object of the present invention is to provide a molding apparatus that solves the above-described problems in the prior art, prevents the molten metal from leaking from the mold mating surface, and can appropriately perform the molding operation. .

In order to solve the above problems, the invention according to claim 1 is arranged such that a lower mold and an upper mold capable of forming a molding cavity are arranged facing each other so as to be close to or away from each other in the vertical direction. A molding material storage chamber communicating with the molding cavity is provided in the lower portion of the mold, and an extrusion rod of an extrusion means disposed at a predetermined position below the storage chamber is inserted into the storage chamber, and the lower mold and the upper mold are closed. In the molding apparatus in which the molding material in the storage chamber is pushed out into the cavity by the push rod by a process of lowering both molds at the same time, the pistons of a plurality of hydraulic cylinders in which the lower mold is provided upward at a predetermined position The rod is supported by a rod so that it can be raised and lowered, and in the process of lowering the lower mold and the upper mold at the same time and pushing the molding material into the cavity, the pressure in the pressurizing chamber of each hydraulic cylinder is Pressure adjusting means for adjusting such type mold-closing state of being retained provided, the cylindrical body constituting the reservoir chamber is fitted fixed to the lower mold, a predetermined position below said lower die in cylindrical body An extrusion rod installed upright on a horizontal support plate provided on the lower support is inserted, and each hydraulic cylinder is installed on the lower support base or horizontal support plate, and the lower mold is formed by an upper end portion of a piston rod of each hydraulic cylinder. The lower die is configured to be replaceable with each hydraulic cylinder remaining on the lower support or the horizontal support plate .

The invention according to claim 2, Oite to claim 1, wherein the conduit connecting the pressure chamber and the liquid tank of each hydraulic cylinder, the supply and the liquid pump, the fluid pressure to said pressure chamber And a switching valve provided with a drain port for discharging the pressurized liquid from the pressurizing chamber, and a drain line connecting the drain port of the switching valve and the liquid tank has pressure as pressure adjusting means. The gist is that a regulating valve is provided.

According to the first or second aspect of the invention, the lower mold and the upper mold are simultaneously moved from the closed state in which the upper mold is moved downward toward the lower mold and the lower surface of the upper mold is in contact with the upper surface of the lower mold. In the process of pouring the molten metal into the cavity that is moved downward, the lower mold is moved downward in a state of being pressed upward by a pressure equal to or higher than a certain value by the piston rods of a plurality of hydraulic cylinders. As a result, the pressing force of the lower die and the upper die mating surfaces is properly maintained, and the molten metal in the cavity can be prevented from leaking out from the die mating surfaces.

The invention according to claim 1 is characterized in that the hydraulic cylinder is formed separately from the lower mold and is attached to a lower support or a horizontal support plate of a molding apparatus, and the lower mold attaches each hydraulic cylinder to the lower support. Alternatively, it is configured to be replaceable while remaining on the horizontal support plate, so there is no need to install hydraulic cylinders on multiple lower dies with different standards, reducing the number of parts and reducing costs. Can do.

Hereinafter, an embodiment of a molding apparatus embodying the present invention will be described with reference to FIGS.
Initially, the schematic structure of the whole shaping | molding apparatus is demonstrated based on FIG.
Legs 12 are provided on the lower surface of the lower support base 11, and guide struts 13 are parallel to each other at a plurality (four in this embodiment) of the upper surface of the lower support base 11 and viewed from above. It is erected so as to be located at the four corners of the rectangle. An upper support 14 is horizontally installed between the upper ends of the guide columns 13. On the upper part of each guide column 13, a lifting plate 15 is mounted horizontally so as to be reciprocable in the vertical direction. The elevating plate 15 is moved up and down by piston rods 17 of a plurality of elevating cylinders 16 (only one is shown) fixed downward on the upper support 14.

  A lower die unit 21 is installed on the upper surface of the lower support 11 so as to be positioned between the four guide columns 13. Further, an upper mold unit 22 is installed on the lower surface of the elevating plate 15. The lower mold unit 21 and the upper mold unit 22 constitute a mold unit 23.

Therefore, the configuration of the lower mold unit 21 and the upper mold unit 22 of the mold unit 23 will be described with reference to FIG.
The horizontal support plate 25 constituting the lower mold unit 21 shown in FIG. 2 is detachably attached to the upper surface of the lower support base 11 shown in FIG. 7 by a clamp mechanism (not shown).

  On the upper surface of the horizontal support plate 25, a plurality (four in this embodiment) of hydraulic cylinders 34 are erected in parallel so as to be located at the four corners of the rectangle as viewed from above. A lower die gripping body 36 made of a metal material such as iron is mounted on the piston rod 35 of each hydraulic cylinder 34 so as to be able to reciprocate in the vertical direction. A lower die 37 is detachably fastened and fixed to a recess provided on the upper surface of the lower die holding body 36 by a bolt 38.

  A cylindrical pedestal 39 is fixed to the upper surface of the central portion of the horizontal support plate 25 by bolts, and a male screw portion 391 formed at the upper end of the pedestal 39 is connected to the female of the extrusion rod 40 constituting the pushing means. The screw part 401 is screwed. A cooling water supply member 41 for supplying cooling water to the cooling jacket 402 provided on the push rod 40 is accommodated in the center of the pedestal 39, and the cooling water is supplied from the outside.

  A cylindrical body 42 is fitted and fixed vertically in the center of the lower mold holding body 36 and the lower mold 37, and a flange formed on the outer periphery of the lower end thereof is fastened and fixed to the lower mold holding body 36 by a bolt 43. A liner 44 is fitted on the inner peripheral surface of the cylindrical body 42 and is held at a predetermined position by a stopper 46 attached to a lower end portion of the cylindrical body 42 by a bolt 45. An upper end portion of the push rod 40 is inserted into an insertion hole 461 formed in the stopper 46 and an inner peripheral surface 441 of the liner 44. A bottomed cylindrical space formed by the inner peripheral surface 441 of the liner 44 and the upper end surface of the extrusion rod 40 is used as a storage chamber 47 for a material to be molded such as molten metal. The molten metal Y is poured into the storage chamber 47 from above.

  Next, the upper mold unit 22 mounted on the elevating plate 15 will be described. The connecting member 511 is connected to a plurality of locations on the upper surface of the first upper mold gripping body 51 made of a metal material. 7 is fixed to the lower surface of the lifting plate 15 shown in FIG. A second upper mold holding body 52 is fastened and fixed to the lower surface of the first upper mold holding body 51 by bolts 53. An upper die 54 is detachably fastened and fixed to the lower surface of the second upper die gripping body 52 by bolts 55. A cavity K (see FIG. 3) for molding a product having a predetermined shape is formed by the second molding surface 541 formed on the upper mold 54 and the first molding surface 371 formed on the lower mold 37. It is like that.

  The first upper mold gripping body 51 is provided with guide posts 56 at a plurality of locations. The first support plate 57 and the second lift plate 58 are connected to the guide support post 56 by bolts 59 and can be moved up and down simultaneously. It is installed. Guide rods 60 are connected to the second elevating plate 58 downward at a plurality of locations (one location shown in FIG. 2), and each guide rod 60 includes a guide passage 521 formed in the second upper mold gripping body 52 and an upper portion. A guide passage 542 formed in the mold 54 is slidably inserted. Further, a cylindrical extrusion cylinder 61 for extruding a product is connected to the second lifting plate 58 downward at a plurality of locations (one location is shown in FIG. 2), and the extrusion cylinder 61 is connected to the second upper mold gripping body 52. And inserted into the guide passages 522 and 543 formed in the upper die 54 so as to be movable up and down. A guide rod 62 is attached to the first upper mold gripping body 51, and an intermediate part and a lower end part thereof are inserted into the push-out cylinder 61.

The upper end of the push pin 71 is connected to the second lift plate 58, and the push pin 71 is inserted into the guide passages 523 and 544 provided in the second upper mold gripping body 52 and the upper mold 54.
Next, the details of the molding apparatus will be described with reference to FIGS.

  A cylindrical support member 72 is fastened and fixed to the second upper mold holding body 52 by bolts 73 (see FIG. 1) at a plurality of locations on the upper surface of the central portion of the second upper mold holding body 52. A cylinder 74 is installed downward on the upper surface of the support member 72 and is fastened and fixed to the support member 72 by bolts 75 (see FIG. 1).

  As shown in FIG. 5, a pressure rod 77 as a pressure member is connected to the piston rod 76 of the cylinder 74. A male screw 771 formed on the upper end of the pressure rod 77 is screwed into a female screw 761 formed on the piston rod 76.

  A cooling water passage 772 is formed at the center of the pressure rod 77 so that the cooling water is supplied from the outside. A flange portion 773 is formed as one body at the upper end of the pressure rod 77. A groove portion 774 is formed in the flange portion 773 in the vertical direction, and an anti-rotation member 81 is fixed to the upper portion of the second upper mold grip body 52 by a bolt 82 so as to be directed in the vertical direction. The groove 774 is engaged with 81. As a result, the rotation of the pressure rod 77 is prevented.

  Guide passages 524 and 545 for guiding and moving the pressure rod 77 in the vertical direction are formed in the second upper mold gripping body 52 and the upper mold 54. A seal member 84 is fitted into a guide passage 545 provided in the upper mold 54, and the pressure rod 77 is guided and moved in the vertical direction by the seal member 84. A damper chamber R for accommodating excess molten metal is formed by the guide passage 545 and the lower end surface of the pressure rod 77.

  Oil is supplied from an oil tank 86 to a first port 85 provided at the upper end of the cylinder 74 by a hydraulic pump 87 and an electromagnetic switching valve 88, pressure oil is supplied to a piston-side cylinder chamber 89, and the damper chamber R The molten metal Y that has entered is pressurized. The second port 91 of the cylinder 74 is supplied with pressure oil to the rod side cylinder chamber 92 in the cylinder 74 by the switching operation of the electromagnetic switching valve 88. The damper rod R can be formed by moving the piston rod 76 and the pressure rod 77 upward.

  A pressure regulating valve 93 is provided in a pipe line connecting the electromagnetic switching valve 88 and the first port 85. The pressure acting on the piston-side cylinder chamber 89 is controlled based on a control signal from a control device having a computer (not shown). Further, when the first port 85 is switched to the drain port by the electromagnetic switching valve 88, the amount of oil discharged from the piston side cylinder chamber 89 to the oil tank 86 is adjusted, and the pressure in the piston side cylinder chamber 89 is adjusted. Can be adjusted.

In this embodiment, the cylinder 74, the piston rod 76, the pressure rod 77, etc. constitute pressure means.
Although not shown in the drawings, the lower mold unit 21 and the upper mold unit 22 are provided with a cooling mechanism for cooling the lower mold 37 and the upper mold 54.

Next, a characteristic configuration of the present invention will be described.
As shown in FIG. 1, the inside of the cylinder body 95 of the hydraulic cylinder 34 is divided into a pressurizing chamber 97 located on the lower side and an atmospheric pressure chamber 98 located on the upper side by a piston 96 connected to the piston rod 35. It is divided into and. Pressure oil is supplied to the pressurizing chamber 97 from an oil tank 99 through a pipe line 100 and a hydraulic pump 101. The conduit 100 connecting the pressurizing chamber 97 and the oil tank 99 includes a supply port 105 for supplying pressure oil to the pressurizing chamber 97 and a drain port 106 for discharging the pressure oil from the pressurizing chamber 97. A switching valve 104 is provided. A pressure adjusting valve 103 as pressure adjusting means is provided in the drain line 102 connecting the drain port 106 of the switching valve 104 and the oil tank 99.

  Accordingly, when the switching valve 104 is switched from the drain port 106 shown in FIG. 1 to the supply port 105, the pressure oil is supplied to the pressurizing chamber 97 via the hydraulic pump 101, and as shown in FIG. The piston 96 and the piston rod 35 are raised, and the lower mold gripping body 36 and the lower mold 37 are moved upward. Conversely, when the switching valve 104 is switched from the supply port 105 to the drain port 106, the pressure oil in the pressurizing chamber 97 is discharged to the oil tank 99 through the pressure adjustment valve 103, and the pressure adjustment valve 103 causes the pressure control valve 103 to perform the addition. The pressure in the pressure chamber 97 is held at a constant value.

Next, the operation of the molding apparatus configured as described above will be described.
FIG. 1 shows a mold opening state in which the upper mold unit 22 is separated upward from the lower mold unit 21, the pressure rod 77 is moved to the lowermost position, and the first port 85 and the electromagnetic switching valve 88 shown in FIG. Both the second ports 91 are switched to the drain port, and the damper chamber R has a minimum volume. Further, the switching valve 104 is switched to the drain port 106, the piston 96 is stopped at the lower limit, the lower mold gripping body 36 and the lower mold 37 are also stopped at the lower limit, and the storage chamber 47 has a minimum volume. . In this state, when the switching valve 104 is switched to switch from the drain port 106 to the pressure supply port 105, the lower mold gripping body 36 is raised by the piston rod 35 as shown in FIG. Maximum volume. In this state, molten metal Y is injected into the storage chamber 47.

  Next, in FIG. 2, the upper die unit 22 is moved downward, and as shown in FIG. 3, the lower surface of the upper die 54 comes into contact with the upper surfaces of the lower die gripping body 36 and the lower die 37 to form a cavity K. Move to the height position, that is, the mold closing position, and stop. In this mold closing state, the pressure in the cavity K is reduced by a decompression mechanism (not shown).

  Thereafter, in a state where the switching valve 104 is switched from the pressure supply port 105 to the drain port 106, the upper mold unit 22 is lowered, and the lower mold holding body 36 and the lower mold 37 are moved downward by the upper mold 54. . In the downward stroke of the lower mold gripping body 36 and the lower mold 37, the extrusion rod 40 relatively moves upward in the liner 44, so that the molten metal Y stored in the storage chamber 47 is press-fitted into the cavity K. . In this way, a product 90 that follows the shape of the cavity K is molded.

  The surplus portion of the molten metal Y flowing into the cavity K enters the damper chamber R while moving the pressure rod 77 upward. At this time, the pressure in the piston-side cylinder chamber 89 is adjusted to an appropriate pressure by the pressure adjusting valve 93 connected to the first port 85 so that a predetermined resistance is given when the pressure rod 77 is pushed upward. To be controlled.

  After the pressure rod 77 is moved to the upper limit position in the final stage of the molding operation, the electromagnetic switching valve 88 is operated to supply pressure oil to the first port 85, and the pressure rod 77 of the cylinder 74 is moved downward. It moves and pressurizes the excess molten metal Y in the damper chamber R. Also at this time, the pressure in the damper chamber R is appropriately controlled by the pressure adjusting valve 93.

  Thus, when the manufacture of the product 90 is completed, the upper mold unit 22 is moved upward, and the first upper mold gripping body 51 and the upper mold 54 are lifted together with the product 90 and are held in the mold open state. The product 90 is separated from the second molding surface 541 by moving the extrusion cylinder 61 and the extrusion pin 71 provided on the first and second elevating plates 57 and 58 downward.

According to the molding apparatus of the above embodiment, the following characteristics can be obtained.
(1) In the above embodiment, the lower mold gripping body 36 that supports the lower mold 37 is held by the piston rods 35 of the plurality of hydraulic cylinders 34 supported by the horizontal support plate 25 so as to be movable up and down. Between the pressurizing chamber 97 and the oil tank 99, pipe lines 100 and 102, a pressure regulating valve 103 and a switching valve 104 are provided. Therefore, during the lowering operation by the upper mold unit 22 of the lower mold gripping body 36, the pressure in the pressurizing chamber 97 of the hydraulic cylinder 34 is reliably maintained by the pressure adjusting valve 103 so that the molds 37 and 54 are closed. Can be kept at the proper pressure. As a result, the mold closing force of the mold mating surfaces of the upper mold 54 and the lower mold 37 is properly maintained, and the molten metal Y in the cavity K is prevented from entering the mold mating surface or leaking outside. Can do.

  (2) In the above embodiment, the damper chamber R is formed in the upper mold 54, and a predetermined pressure is applied to the piston side cylinder chamber of the cylinder 74. For this reason, a part of the molten metal Y supplied into the cavity K from the storage chamber 47 pushes the pressure rod 77 upward and flows into the damper chamber R, so that the excessive molten metal Y as an excessive molding material is used. It can escape from the cavity K to the outside. Therefore, it is possible to prevent the excess molten metal from entering the die-matching surfaces of the lower die 37 and the upper die 54 to damage the outer shape of the product.

In addition, since it is not necessary to strictly manage the amount of molten Y stored in the storage chamber 47, the operation of injecting the molten Y into the storage chamber 47 can be performed quickly, and the efficiency of the molding operation can be improved.
(4) In the embodiment, the pressure rod 77 is held at a position where the volume of the damper chamber R is minimized at the start of the extrusion operation of the molten metal Y by the extrusion rod 40, and the volume is maximized at the final stage of the extrusion operation. I was able to switch to the position. For this reason, compared with the case where the volume of the damper chamber R is maximized from the beginning, the molten metal Y can be reliably filled in the cavity K.

  (5) In the above embodiment, the piston rod 76 of the cylinder 74 can be moved downward, and the pressure chamber 77 can pressurize the damper chamber R containing excess molten metal, thereby improving the density of the product. it can.

Next, another embodiment of the present invention will be described with reference to FIG.
In this embodiment, the hydraulic cylinder 34 and the piston rod 35 are mounted on the lower surface side of the lower support 11. On the upper surface of the horizontal support plate 25, a guide rod 107 inserted into a guide hole 362 formed in the lower mold gripping body 36 is erected. Although not shown, the hydraulic cylinder device 34 is connected to the same hydraulic circuit device as that of the above-described embodiment (see FIG. 1). Other configurations are the same as those of the molding apparatus of the above embodiment.

  In this embodiment, since the hydraulic cylinder 34 is provided on the lower support base 11 side, the number of parts of the lower mold unit 21 of a different model is reduced as compared with the configuration provided on the lower mold unit 21 side. Therefore, the manufacturing can be facilitated and the cost can be reduced.

In addition, this invention can also be changed and embodied as follows.
The configuration of the pressure adjusting means may be appropriately changed, for example, such that the pressure in the pressurizing chamber 97 increases in proportion to the distance by which the lower mold unit 21 descends.

  In the above embodiment, the product is manufactured using the molten metal. However, the product may be molded using a semi-solid material in which a solid and a liquid coexist as a material to be molded. Further, for example, a metal molding material such as solid aluminum heated to 200 to 300 ° C. may be accommodated in the storage chamber 47 and hot-molded.

In each of the above embodiments, the lower mold unit 21 may be tilted by a tilting mechanism, or may be switched from a mold matching position to a position retracted forward, sideward, or rearward.
○ The pressure rod 77 is moved upward before the molding operation is started, the surplus molten metal is introduced into the damper chamber R during the molding operation, and the pressure rod 77 is moved downward at the final stage of the molding operation. Thus, the excess molten metal in the damper chamber R may be pressurized.

The formation position of the damper chamber R may be set at an arbitrary position on the first molding surface 371 of the lower mold 37 or the second molding surface 541 of the upper mold 54.
○ The pressure rod 77 is moved upward before the molding operation is started to open the damper chamber R. After the lower die 37 and the upper die 54 are aligned, the molten metal Y is moved into the cavity K and the damper chamber by the extrusion rod 40. Enter R. Thereafter, the pressure adjusting valve 93 controls the pressure in the piston-side cylinder chamber 89 to move the pressurizing rod 77 downward at a low pressure, pressurize the excess molten metal in the damper chamber R, and apply a high pressure after a predetermined time. The pressure rod 77 may be moved further downward.

  In this other example, the excess molten metal in the damper chamber R can be caused to flow into the cavity K to eliminate variations in the filling state of the molten metal in the cavity. Further, since the excess molten metal is pressurized at a high pressure, it is possible to prevent the formation of a sink nest in the molded product.

The pressure rod 77 may be switched to a position where the volume of the damper chamber R becomes maximum after the operation of pushing out the molding material of the storage chamber 47 into the cavity K is completed.
The pressure rod 77 may be switched to a position where the volume of the damper chamber R is minimized after the operation of pushing the material to be molded in the storage chamber 47 into the cavity K is completed.

  The pressurizing member (pressurizing rod 77) of the pressurizing means is held at a position where the volume of the damper chamber R is maximized at the start of the extrusion operation of the molding material by the extruding means (extrusion rod 40). After the extruding operation of the material to be molded into the cavity K is completed, the excess molten metal in the damper chamber R may be pressurized at a low pressure by a pressure member, and then the excess molten metal may be pressurized at a high pressure. .

(Circle) you may change the arrangement | positioning position of the said extrusion rod 40 suitably.
The installation position of the pressure regulating valve 93 may be changed to a drain passage dedicated to the first port 85 connected to the electromagnetic switching valve 88.

As a hydraulic cylinder, other hydraulic cylinders may be used besides the hydraulic cylinder.
(Technical thought)
The technical idea grasped from the above embodiment will be described below.

(1) In Claim 1 or 2 , a damper chamber for storing the surplus molding material in the cavity is provided for the upper mold or the lower mold, and a pressurizing means for pressurizing the surplus molding material is provided. Characteristic molding equipment.

(2) In the above (1), the pressurizing means is a fluid pressure cylinder, and a pressurizing member reciprocated by the piston rod is housed in a damper chamber.
(3) In the above (1) or (2), the pressurizing member of the pressurizing means is held at a position that minimizes the volume of the damper chamber at the start of the extrusion operation of the molding material by the extruding means, A molding apparatus configured to be switched to a position where the volume becomes maximum at the final stage of the operation of pushing the molding material of the storage chamber into the cavity.

  (4) In the above (1) or (2), the pressurizing member of the pressurizing means is held at a position that maximizes the volume of the damper chamber at the start of the extrusion operation of the molding material by the extruding means, A molding apparatus configured to be switched to a position where the volume is minimized at the final stage of the pushing operation of the molding material in the storage chamber to the cavity.

  (5) In the above (1) or (2), the pressurizing member of the pressurizing means is held at a position that maximizes the volume of the damper chamber at the start of the extrusion operation of the molding material by the extruding means, After the operation of pushing out the material to be molded in the storage chamber to the cavity is completed, the pressurizing member pressurizes the excess molten metal in the damper chamber at a low pressure, and then pressurizes the surplus molten metal at a high pressure. Molding device.

The longitudinal cross-sectional view which shows the mold open state of the lower mold unit and upper mold unit of the molding apparatus of this invention. The longitudinal cross-sectional view of the mold opening state which shows the state which stored the molten metal in the storage chamber. The longitudinal cross-sectional view which shows the type | mold matching state of a lower mold unit and an upper mold unit. The longitudinal cross-sectional view of the molding completion state of a shaping | molding apparatus. The partial expanded longitudinal cross-sectional view of the mold fitting state of a shaping | molding apparatus. The partial expansion longitudinal cross-sectional view which shows the molding completion state by a lower mold unit and an upper mold unit. FIG. The longitudinal cross-sectional view of the mold open state of the lower mold | type unit and upper mold | type unit which shows another embodiment of this invention. Sectional drawing of the mold opening state which shows the conventional shaping | molding apparatus. The mold matching state figure which shows the conventional shaping | molding apparatus. Sectional drawing of the completion state of shaping | molding which shows the conventional shaping | molding apparatus.

Explanation of symbols

  K ... cavity, R ... damper chamber, Y ... surplus molten metal, 11 ... lower support base, 17, 29, 33, 76 ... piston rod, 21 ... lower mold unit, 22 ... upper mold unit, 25 ... horizontal support plate, 34 DESCRIPTION OF SYMBOLS ... Hydraulic cylinder, 36 ... Lower mold holding body, 37 ... Lower mold, 40 ... Extrusion rod, 42 ... Cylindrical body, 47 ... Storage chamber, 54 ... Upper mold, 89 ... Piston side cylinder chamber, 93, 103 ... Pressure regulating valve 97 ... Pressurizing chamber, 100, 102 ... Pipe line, 102 ... Drain pipe line, 104 ... Switching valve, 105 ... Supply port, 106 ... Drain port.

Claims (2)

A lower mold and an upper mold capable of forming a molding cavity are arranged opposite to each other so as to be close to or away from each other in the vertical direction, and a storage chamber for a molding material communicating with the molding cavity is provided below the lower mold. The pushing rod of the pushing means arranged at a predetermined position below the storage chamber is inserted into the storage chamber, and the molding material of the storage chamber is transferred by the process of lowering both molds simultaneously after closing the lower mold and the upper mold. In a molding apparatus that is extruded into the cavity by an extrusion rod,
In the process of supporting the lower mold by piston rods of a plurality of hydraulic cylinders provided upward at predetermined positions, and simultaneously lowering the lower mold and the upper mold to push the molding material into the cavity, Pressure adjusting means for adjusting the pressure of the pressurizing chamber of the pressure cylinder so as to maintain the mold closed state of both molds is provided , and a cylindrical body constituting the storage chamber is fitted and fixed to the lower mold, and the cylinder The body is inserted with push rods erected on a horizontal support plate provided at a predetermined position below the lower mold, and the hydraulic cylinders are erected on the lower support plate or the horizontal support plate. The lower die is supported by the upper end portion of the piston rod of the cylinder, and the lower die is configured to be replaceable in a state where each hydraulic cylinder is left on the lower support base or the horizontal support plate. Molding device . 2. The pipe connecting the pressurizing chamber and the liquid tank of each hydraulic cylinder according to claim 1 includes a liquid pump, a supply port for supplying hydraulic pressure to the pressurizing chamber, and a pressurized liquid from the pressurizing chamber. And a switching valve having a drain port for discharging the pressure, and a drain pipe line connecting the drain port of the switching valve and the liquid tank is provided with a pressure regulating valve as pressure regulating means. Molding equipment.

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