JP4519764B2 - Differential pressure casting equipment - Google Patents

Description

  The present invention relates to a differential pressure casting apparatus capable of filling molten metal into a cavity by a pressure difference.

  A conventional differential pressure casting apparatus includes a holding furnace capable of holding a predetermined capacity of a molten metal such as an aluminum material, a first chamber part that holds the holding furnace in a substantially hermetically sealed state, and is mounted on the first chamber part. The second chamber part that holds the mold having the cavity in a substantially hermetically sealed state, and the stalk that communicates the cavity of the mold with the inside of the holding furnace, are substantially equal in the first chamber part and the second chamber part. After pressurization, the pressure in the second chamber portion was controlled to be lower than that in the first chamber portion.

  Thus, the molten metal in the holding furnace rises through the stalk due to the differential pressure between the first chamber part and the second chamber part, and is introduced into the cavity. Then, after the molten metal in the cavity is cooled and solidified, the molten metal in the stalk can be returned to the holding furnace by gravity by releasing the differential pressure between the first chamber part and the second chamber part. If the mold (upper mold, lower mold or movable mold, fixed mold) is separated while lifting the second chamber portion up by a predetermined dimension in such a state, the product can be taken out from the inside. In addition, since this prior art does not relate to the literature known invention, there is no prior art document information to be described.

  However, in the above-described conventional differential pressure casting apparatus, since the mold accommodated in the second chamber part is a mold, the upper mold and the lower mold (or the fixed mold) with the second chamber part slightly lifted upward. If the mold and the movable mold) are separated from each other, the product inside can be taken out. However, when the sand mold is accommodated in the second chamber portion, there are the following problems.

  That is, since the sand mold needs to be replaced every shot, it is necessary to remove the mold itself after the molten metal cools and solidifies in the cavity, and it is necessary to place a new sand mold while positioning it at the next molding. is there. For this reason, there has been a problem that it is extremely difficult to remove and attach the sand mold by simply lifting the second chamber portion upward as in the prior art. For example, after the molded sand mold is lifted and removed by hanging it with a crane, etc., in order to attach a separate new sand mold with the crane, etc., there is an interference if there is a second chamber part above the sand mold placement position. It will be done. Although it is considered that the above-described interference can be avoided if the second chamber portion is lifted to a very high place, in that case, there is a problem that the apparatus becomes large, and the practicality becomes poor.

  The present invention has been made in view of such circumstances, and even when a differential pressure casting is performed using a sand mold, it is possible to easily remove the sand mold after molding and attach the sand mold before molding. An object of the present invention is to provide a differential pressure casting apparatus that can be used.

According to the first aspect of the present invention, there is provided a holding furnace capable of holding a predetermined volume of molten metal, a first chamber part for accommodating the holding furnace in a substantially hermetically sealed state, a predetermined cavity disposed on the first chamber part. From the holding furnace, a mounting table capable of mounting a mold having a mold, a second chamber section that is detachably attached to the upper portion of the first chamber section, and that accommodates the mold on the mounting table in a substantially hermetically sealed state; extends to the mounting table, the stalk for communicating between the holding furnace and before Symbol cavity, with pressurizing the first chamber portion and a second chamber portion, towards the inner second chamber portion is the A differential pressure casting apparatus comprising pressurizing means that can be controlled so that the pressure is smaller than in one chamber part, and moving means that moves the second chamber part to remove and attach it from the upper part of the first chamber part. In Te, wherein the first chamber portion is arranged between the second chamber portion, airtight an accommodation space for accommodating the mounting table of the the second chamber portion while defining the first chamber portion The second chamber part is provided with closing means comprising a clutch door that can be detached from the first chamber part by unlocking, and a sand mold is provided on the mounting table. In addition to being mounted, the moving means can move the second chamber part upward, remove it, and then move it sideways to retract from the upper part of the mounting table.

  According to a second aspect of the present invention, in the differential pressure casting apparatus according to the first aspect, the moving means is a first driving means for lifting the second chamber part upward, and the second chamber part pivoted from this state. And a second driving means for moving the device sideways.

  According to a third aspect of the present invention, in the differential pressure casting apparatus according to the first or second aspect of the present invention, the mounting table includes a standing portion that is erected upward from substantially the entire side edge thereof. To do.

  According to the first aspect of the present invention, since the moving means for moving the second chamber part can lift the second chamber part upward and remove it, it can be moved to the side to retract from the upper part of the mounting table. Even when the differential pressure casting is performed using a sand mold, the sand mold after molding can be easily removed and the sand mold before molding can be attached.

  According to the invention of claim 2, the moving means lifts the second chamber part upward by the first driving means, and turns from the state by the second driving means to move the second chamber part to the side. Therefore, the second chamber part can be moved more stably.

  According to the invention of claim 3, since the mounting table has an upstanding portion that is erected upward from substantially the entire side edge thereof, the sand dropped from the sand mold onto the mounting table, or the sand mold during casting is damaged. In this case, it is possible to prevent the molten metal overflowing from leaking outside the side edge.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The differential pressure casting apparatus according to the present embodiment is for obtaining an aluminum molded product as a product by differential pressure casting using a sand mold. For example, as shown in FIG. 1 and FIG. It mainly comprises a pressure casting apparatus main body 1, moving means 2 for moving the second chamber section, and transfer means 3 for transferring a sand mold.

  The differential pressure casting apparatus main body 1 mainly includes a holding furnace 4 (so-called crucible), a first chamber part 5, a second chamber part 6, a stalk 7, and a pressurizing means C. The holding furnace 4 has a shape in which an upper portion is opened while holding a predetermined volume of molten metal (a molten aluminum material in the present embodiment), and is substantially at the center of the bottom portion 15 inside the first chamber portion 5. It is placed on the formed base 16.

The first chamber portion 5 is configured such that the upper portion thereof is closed by the lid portion 10 so that the holding furnace 4 can be accommodated in a substantially hermetically sealed state. Yes. Thereby, the molten state of the molten metal in the holding furnace 4 can be maintained. Further, the molten metal in the upper part of the first chamber portion 5 is formed with a closure means 12 made Kuratchido A or al, by releasing the lock by such closing means 12, for example the holding furnace 4 by opening the upper It is configured to be replenished.

The second chamber portion 6 is attached to the upper portion of the first chamber portion 5 in a removable state, and can accommodate the sand mold 8 on the mounting table 9 in a substantially sealed state. Specifically, the second chamber section 6, (similar to the closure means 12, consisting click Ratchidoa) closing means 11 with respect to the lid portion 10 on by being engaged in an airtight manner, the first chamber portion 5 Has a defined storage space and the mounting table 9 is fixed in the storage space.

  As shown in FIG. 4, the mounting table 9 is fixed to the lid portion 10 with bolts B arranged concentrically, and is erected upward from substantially the entire side edge (periphery). A portion 9a is formed. Thereby, it is possible to prevent the sand that has fallen from the sand mold 8 to the mounting table 9 or the molten metal that overflows when the sand mold 8 being cast is damaged to leak outside the side edge. On the other hand, the sand mold 8 on the mounting table 9 has a cavity 8a following the product shape inside, and a runner 8b is formed downward from the cavity 8a.

  In addition, holes 10a and 9b (see FIG. 4) are formed at substantially the center of the lid 10 and the mounting table 9, respectively, and the upper end of the stalk 7 is fixed to these holes 10a and 9b. The stalk 7 is composed of a tubular member extending in the vertical direction from the holding furnace 4 to the mounting table 9, whereby the inside of the holding furnace 4 is communicated with the cavity 8 a through the runner 8 b of the sand mold 8. ing.

  By the way, the first chamber part 5 and the second chamber part 6 are respectively formed with connecting pipes 14 and 13 for communicating the inside and the outside. The connecting pipes 13 and 14 are not shown in the figure. Is connected to the pressurizing means C. The pressurizing means C pressurizes the inside of the first chamber portion 5 and the second chamber portion 6, and the pressure in the second chamber portion 6 is smaller than that in the first chamber portion 5 when molding with the sand mold 8. It can be controlled to be.

  When a pressure difference is generated between the first chamber part 5 and the second chamber part 6 by the pressurizing means C, the molten metal in the holding furnace 4 rises at the stalk 7 and is cavityd via the runner 8b. 8a will be introduced. If this state is maintained for a certain period of time, the molten metal in the cavity 8 is cooled and solidified to obtain a product (aluminum molded product). At this time, in the second chamber part 6, although a pressure is lower than that of the first chamber part 5, a predetermined pressure is applied, so that generation of pinholes can be suppressed.

  After that, if the differential pressure between the first chamber part 5 and the second chamber part 6 is released, the lock by the closing means 11 is released, and the second chamber part 6 is removed from the first chamber part 5, the sand mold 8 is moved to the outside. Since it is in an exposed state, if the sand mold 8 is lifted by the transfer means 3, it can be transferred to another predetermined position. If the sand of the sand mold 8 is removed, a product (aluminum molded product) having a predetermined shape can be obtained from the inside.

  As shown in FIG. 1, the transfer means 3 includes a column portion 22 erected from the floor surface, a beam portion 23 extending from the upper end of the column portion 22 to the upper side of the differential pressure casting apparatus main body 1, and the beam. It mainly comprises suspension means 24 slidable along the portion 23. As a result, after one shot of molding is completed, a driving source (not shown) is driven to move the suspending means 24 to above the sand mold 8, and the suspension means 24 can be connected and suspended to be transferred to another predetermined position. Yes.

  Further, at the time of the next molding, the new sand mold 8 is suspended by the suspension means 24 and the suspension means 24 is moved onto the mounting table 9. After that, the opening of the runner 8b facing the lower surface of the sand mold 8 is positioned so as to coincide with the hole 9b of the mounting table 9, and the suspension means 24 and the sand mold 8 are disconnected to mount the sand mold 8. Place on the mounting table 9. However, if the removed second chamber part 6 is mounted on the first chamber part 5 again and locked by the closing means 11, the above-described series of differential pressure casting can be performed.

  Here, in the differential pressure casting apparatus according to the present embodiment, the moving means 2 capable of removing and attaching the second chamber portion 6 from the first chamber portion 5 is disposed. As shown in FIGS. 1 and 2, the moving means 2 includes a column portion 17 erected from the floor surface, an arm portion 18 a connected to the upper end of the second chamber portion 6, and a cylinder 19 (first Driving means) and a sliding portion 18 that can slide and turn in the vertical direction by driving the motor 20 (second driving means).

  Specifically, a guide portion 17a that can rotate around its axis is provided on the upper portion of the column portion 17, and a sliding portion 18 is arranged to be slidable in the vertical direction with respect to the guide portion 17a. It is installed. That is, since the tip of the rod 19a in the cylinder 19 is connected to the sliding portion 18, when the cylinder 19 is driven to move the rod 19a forward and backward, the sliding portion 18 rises or falls along the guide portion 17a. It is configured as follows.

  On the other hand, the output shaft of the motor 20 is connected to the interlocking portion 21. When the motor 20 is driven, the interlocking portion 21 can rotate together with the guide portion 17a. Thus, the sliding portion 18 also rotates together with the guide portion 17a, and the arm portion 18a extending from the sliding portion 18 turns in a state where the second chamber portion 6 is connected. Below, the operation | movement in the moving means 2 is demonstrated.

  After the one-shot differential pressure casting is completed and the differential pressure between the first chamber portion 5 and the second chamber portion 6 is released, the blocking means 11 is unlocked. In this state, if the cylinder 19 is driven to extend the rod 19a and the sliding portion 18 is raised along the guide portion 17a, the second chamber portion 6 connected to the arm portion 18a is moved upward by a predetermined dimension. To be removed from the first chamber portion 5.

  Thereafter, if the motor 20 is driven to rotate the interlocking portion 21, the guide portion 17 a and the sliding portion 18 rotate with respect to the column portion 17, so that the arm portion 18 a formed on the sliding portion 18 and the The 2nd chamber part 6 connected with the arm part 18a will turn. At the time of this turning, as shown in FIG. 2, the turning is continued until the second chamber portion 6 is moved to the side to be retracted from the upper part of the mounting table 9.

  As a result, the second chamber portion 6 is retracted from the upper part of the mounting table 9, so that the sand mold 8 for the next shot can be easily lifted above the mounting table 9 while being suspended by the hanging unit 24 of the transfer unit 3. Can be moved. Then, the sand mold 8 is placed while being positioned on the placing table 9, and after the suspending means 24 is retracted, the second chamber part 6 is mounted on the first chamber part 5.

  That is, after the motor 20 is driven (rotated in the opposite direction), the cylinder 19 is driven to return the rod 19a to the initial position, and the second chamber portion 6 is mounted on the first chamber portion 5. Therefore, if both are locked by the closing means 11, the differential pressure casting for the next shot can be performed. At the time of differential pressure casting, the connection between the arm portion 18a and the second chamber portion 6 is released.

  As described above, according to the present embodiment, after the moving means 2 for moving the second chamber portion 6 lifts and removes the second chamber portion 6, it is laterally moved to retreat from the upper portion of the mounting table 9. Since it can be moved, even if the sand mold 8 is used for differential pressure casting, the sand mold 8 after molding can be easily removed and the sand mold 8 before molding can be easily attached. Further, the moving means 2 lifts the second chamber portion 6 upward by the cylinder 19 (first driving means), and turns from the state by the motor 20 (second driving means) to move the second chamber portion 6. Since it moves to a side, the movement of the 2nd chamber part 6 more stable can be enabled.

  Although the present embodiment has been described above, the present invention is not limited to this. For example, the moving unit may have the following configuration. After the second chamber part 6 is lifted upward and removed from the first chamber part 5, it can be a moving means that linearly moves to the side in order to retract from the upper part of the mounting table 9. That is, the movement from the top of the mounting table 9 to the side may be swiveled as in the present embodiment, or may be moved linearly instead.

  Further, the differential pressure casting apparatus main body 1 generates a differential pressure between the first chamber part and the second chamber part, and introduces the molten metal from the holding furnace in the first chamber part to the sand mold cavity in the second chamber part. Any other form may be used. Furthermore, instead of the cylinder 19 according to the present embodiment, other driving means that can lift the second chamber portion upward, or other driving means that can turn the second chamber portion instead of the motor 20 may be used.

It is disposed between the first chamber part and the second chamber part, and locks in an airtight manner while defining an accommodation space for accommodating the mounting table in the second chamber part with respect to the first chamber part. The second chamber part is provided with closing means comprising a clutch door that can be detached from the first chamber part by unlocking, and a sand mold is placed on the mounting table. If the differential pressure casting apparatus is provided with a moving means that can be moved to the side to retreat from the upper part of the mounting table after the second chamber part is lifted and removed, the one having a different external shape or other functions It can also be applied to those added.

Side surface schematic diagram which shows the differential pressure casting apparatus which concerns on embodiment of this invention. Plane schematic diagram showing the differential pressure casting machine Cross-sectional schematic diagram showing the main body of the differential pressure casting apparatus in the differential pressure casting apparatus The top view which shows the mounting base in the differential pressure casting apparatus VV line sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Differential pressure casting apparatus main body 2 Moving means 3 Transfer means 4 Holding furnace 5 1st chamber part 6 2nd chamber part 7 Stoke 8 Sand mold 8a Cavity 9 Mounting stand 9a Standing part 10 Lid part 11,12 Closure means 13,14 Communication pipe 15 Bottom 16 Stand 17 Pillar 18 Sliding 19 Cylinder (first drive means)
20 Motor (second drive means)
21 Interlocking part 22 Column part 23 Beam part 24 Hanging part C Pressurizing means

Claims (3)

A holding furnace capable of holding a predetermined volume of molten metal;
A first chamber for accommodating the holding furnace in a substantially sealed state;
A mounting table disposed on the first chamber portion and capable of mounting a mold having a predetermined cavity;
A second chamber part that is detachably attached to the upper part of the first chamber part and accommodates the mold on the mounting table in a substantially hermetically sealed state;
Extending from the holding furnace to the mounting table, the stalk for communicating between the holding furnace and before Symbol cavity,
Pressurizing means capable of pressurizing the inside of the first chamber part and the inside of the second chamber part, and capable of controlling the pressure in the second chamber part to be smaller than that in the first chamber part;
Moving means for moving the second chamber part to remove and attach it from the upper part of the first chamber part;
In the differential pressure casting apparatus comprising:
An air space is provided between the first chamber portion and the second chamber portion and defines an accommodating space for accommodating the mounting table in the second chamber portion with respect to the first chamber portion. The second chamber part is provided with a closing means comprising a clutch door which is locked and unlocked, and the second chamber part can be removed from the first chamber part by unlocking, and a sand mold is placed on the mounting table. In addition, the moving means can lift the second chamber part upward and remove it, and then move the second chamber part to the side to retract from the upper part of the mounting table.   The moving means includes first driving means for lifting the second chamber part upward, and second driving means for turning from the state to move the second chamber part to the side. Item 2. The differential pressure casting apparatus according to Item 1.   The differential pressure casting apparatus according to claim 1 or 2, wherein the mounting table has a standing portion that is erected upward from substantially the entire side edge thereof.

Images