JPH0138593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a casting line using a casting flask,
More specifically, it relates to a method for cooling a mold after pouring.

(Prior Art) FIG. 4 illustrates a general layout of a casting line using a conventional casting flask.

As shown in the figure, the mold made by the mold making machine 30 is inverted by the upper and lower frame reversing machine 31, and then transferred to the core storage zone 32, where a predetermined core is placed in the lower mold. It can be paid. Subsequently, the upper mold is inverted by the upper mold reversing machine 33, and then placed on the lower mold by the frame matching machine 34 to perform frame matching. Thereafter, a weight is placed on the mold by a weight transfer device 35, and then molten metal is poured into the molten metal pouring zone 36. Then, the mold after pouring is cooled while being transferred through a plurality of cooling lanes 37 (the figure shows the case of three rows), and after the cooling process is finished, the flask and mold are separated by a mold release device 38. Separation and demolding of the mold are performed. The flask separated from the mold is sent to the mold making machine 30 again,
Further, the mold after being demolded is separated into a product and sand by a sand separator 39. The surface plate is removed from the mold before the demolding step and is returned to the surface plate setting position in front of the core storage zone 32 through the surface plate return lane as shown by the dotted line in the figure.

(Problems to be Solved by the Invention) By the way, in the casting line with the above-described layout, a plurality of rows of cooling zones 37 are configured in order to gain cooling time for the mold after pouring. In cases where a large space is required and multiple rows cannot be installed due to space constraints, a single row is extended or the line takt is lengthened. Further, when a plurality of rows of cooling lanes 37 are installed, the exit portion of the cooling lanes 37 becomes complicated because the order of flow of the molds is not changed (first in/first out).

Furthermore, when casting ductile castings (FCD) or thick-walled castings that require cooling for a longer period of time on a line installed for medium and small cast iron (FC), for example, line tact is required. There is a large amount of lost time due to stretching or not being able to start the next dissimilar casting until the casting of medium and small items is completed, and the casting (molding) efficiency when changing the type of cast product is extremely low. It was bad. Furthermore, it is difficult to manage a large number of casting flasks and surface plates that require precision, and furthermore, due to the layout, the mold release device 38 and sand separation device 39 are located near the molding worker. Because of the installation, there were problems such as a worsening of the working environment for molding workers due to dust, noise, etc.

SUMMARY OF THE INVENTION In view of the above problems, the present invention aims to shorten the mold cooling time after pouring in a casting line using a casting flask, as a technical problem to be solved.

(Means for solving the problem) The technical means for solving the above problem is to use a molding flask that is intermittently transferred through a casting line that includes at least a molding process, a pouring process, and a minimum necessary cooling process. The mold that has been made and poured is cooled to some extent in a cooling lane that constitutes the cooling process, and then transferred to a cooling flask that is intermittently transferred through a cooling line that is installed separately from the casting line. In this method, a connecting portion between the cooling lane and the cooling line is used as a transfer position of the mold, and a punch-out head of a punch-out device disposed above the transfer position is lowered to transfer the mold. The mold in the casting flask for molding is dropped and the product is transferred into the cooling flask waiting below the molding flask without exposing the product from the casting sand.

(Function) When the mold after pouring is transferred from the molding flask to the cooling flask, the green sand is loosened from the condition at the time of molding, and the sand becomes loose and may come into contact with the product. By replacing the sand, water evaporation of the green sand becomes more active, or the product comes into contact with sand with high moisture content, and as a result, the mold is effectively cooled.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. Figure 1 shows the layout of the casting line in this example, Figure 2 shows the punch-out state for transferring the mold, and Figure 3 shows the state where the mold has been transferred to the cooling flask. This is what is shown. In the figure, 1 is a molding lane in which a series of operations from molding to pouring are carried out, and the mold 16 molded in the molding flask 15 by the mold molding machine 2 is transferred to the upper and lower frame reversing machine 3, Core storage zone 4, upper frame reversing machine 5, frame aligning machine 6, weight transfer device 7
(This straddles the cooling lane 9.) After passing through each process, molten metal is poured in the pouring zone 8. Thereafter, the mold 16 is sent via a traverse (not shown) to a single row of cooling lanes 9 arranged parallel to the molding lane 1, and is intermittently transferred in the opposite direction to the molding lane 1, The weight is removed.

A transfer position for the mold 16 is set at the end of the cooling lane 9, and after the casting flask 15 for molding is removed from the surface plate, it is sent to this transfer position. The punch-out device 10 transfers the mold from the molding flask 15 to the cooling flask 17. That is, the mold 16 after pouring is cooled to a certain extent in the single row of cooling lanes 9, and then transferred to a cooling line 12 installed independently from the cooling lanes 9.

That is, the cooling line 12 connects to the casting flask 15 for molding.
A cooling-only casting flask 1 that is intermittently transferred in synchronization with the casting flask 15 and has a slightly larger inner diameter and height than the casting flask 15.
7, and these flasks 17 are sent below the molding flask 15 via the traverse 11 at a position facing the transfer position while being mounted on the base plate 19. Then, as shown in FIG. 2, the punch-out device 10 lowers the punch-out head 14 connected to the lower end of the rod 13a of the vertically installed punch-out cylinder 13 above the transfer position. The mold 16 in the flask 15 for cooling is pushed down from above, and the flask 17 for cooling is supported by the traverse 11 (representing the transfer roller) and is waiting below as shown by the imaginary line in FIG. Store it inside. In this embodiment, the punch-out head 14 is formed in the shape of a box frame that is slightly smaller than the molding flask 15, and each of the four peripheries at the lower end thereof has an appropriate slope, and the edge is shaped like a knife. This allows the mold 16 to be easily pushed down.

Note that the mold 15 for molding, which has become empty after the mold 16 has been pushed down, is separated into an upper frame 15a and a lower frame 15b by a frame separation device (not shown), and then sent to the mold making machine 2. Furthermore, the surface plate removed from the flask 15 immediately before the mold transfer position is returned to the surface plate setting position via the surface plate return lane shown by the dotted line in FIG.

Also, a cooling flask 17 that receives the mold 16
is returned to the cooling line 12 side by the traverse 11 and transferred onto the roller 21 of the frame 20 that constitutes the cooling line 12 as shown in FIG. 2
0 and is intermittently transferred over the cooling line 12.
The mold is sent to a demolding device 22 installed in the middle of the process. The mold breaking device 22 lifts up the cooling flask 17 and removes the mold 16 remaining on the base plate 19.
is extruded onto a sand separating device 23 (for example, a sand shaking device as shown) to separate the sand. The product 18 thus separated from the sand is sent to the next process while being cooled by a cleaning drum or an apron conveyor. Further, the cooling flask 17 from which the mold 16 has been discharged is placed on the base plate 19 again, and after its inner surface is cleaned by a frame cleaning device (not shown), it is moved to the mold transfer position side. be returned.

As described above, the mold 16 after pouring the metal is transferred from the molding flask 15 to the cooling flask 17 after the preliminary cooling process (when the product has solidified to a certain extent). Although the sand is cooled, when the mold 16 is dropped from the molding flask 15 to the cooling flask 17 and stored, the green sand becomes hard and compacted during molding, as shown in Figure 3. The product 18 is loosened and becomes loose, and the dry green sand that had been in contact with the product 18 is replaced to some extent by the green sand in the non-contact position. As a result, the moisture in the green sand evaporates more easily in the mold 16 transferred to the cooling flask 17 than when it is in the molding flask 15.
Moreover, the rate of slow cooling of the product 18 is increased by the product 18 coming into contact with the high moisture green sand. That is, the cooling effect of the mold 16 is performed more actively than when it is in the flask 15 for molding.

When dropping and transferring the mold 16, the punch-out head 14 descends to cut the inner periphery of the molding flask 15, so the mold 16 remains wrapped around the product 18 without being destroyed. Since the product 18 is housed in the cooling flask 17, the product 18 does not come into contact with the outside air, and initial slow cooling can be carried out without any problems.

Note that the present invention is not limited to the illustrated embodiment, and can be modified as necessary. For example, the traverse 11 transports the flask 17 in the cooling line 12 to the mold transfer position, and after receiving the mold 16, returns it back to the cooling line 12, replacing it with a transfer box truck whose bottom plate can be opened and closed for use only for delivery. It is installed so that it can be moved back and forth between the lane 9 side and the cooling line 12 side, and with the bottom plate closed by this relocation box car, the cooling lane 9
After receiving the mold 16 from the molding flask 15 on the side, the mold 16 is transferred to the cooling flask 17 by moving to the cooling line 12 side and releasing the bottom plate.
It is possible to use a method of dropping and relocating. In addition, instead of using an indirect method using the traverse 11 or the transfer box truck as described above, the cooling line 12 is installed so as to pass directly under the cooling lane 9, and the cooling flask 17 is moved from the molding flask 15 to the cooling flask 17. It is also possible to change the format so that it can be directly transferred to . Furthermore, the punch-out head 14 in the punch-out device 10 may have a flat shape instead of the box shape shown.

(Effects of the Invention) As detailed above, the present invention allows the mold after pouring to be cooled to a certain extent, and then transferred to a cooling flask in a separate cooling line for cooling. The cooling time of the mold can be shortened compared to conventional methods, which simplifies the cooling lane in the casting line, which in turn improves maintainability, simplifies the weight transfer device, and simplifies the electrical sequence. This makes it possible to achieve the following goals. Also,
It is possible to significantly reduce the number of molding flasks and surface plates that require precision, and replace them with inexpensive cooling flasks that do not require much precision, resulting in a reduction in equipment costs.

Furthermore, according to the present invention, by separately installing a cooling line, the casting line can cast different products regardless of the order or time, regardless of the length of cooling time of the casting due to differences in material and wall thickness. This eliminates loss time when changing types and improves molding efficiency.

Moreover, according to the present invention, there are no special restrictions when installing the cooling line and there is freedom, so the mold breaking equipment and sand separation equipment that generate noise and dust are isolated from the molding worker. Furthermore, by installing the cooling line toward the next process, such as the shot process or deburring process, it becomes possible to shorten or eliminate the process of transporting the product to the next process. Furthermore, if necessary, the cooling line can be placed lower than the molding/cooling lane, so for example, by arranging the cooling line underground, the space above ground in the factory can be used effectively.

Furthermore, according to the present invention, the mold after pouring is transferred from the molding flask to the cooling flask by falling down from above with a punch-out head, so that the mold after being transferred is not affected by the impact of the drop. As a result, the casting sand is loosened from its previous hard state and becomes loose, and the dry green sand that had been in contact with the product is replaced with high-moisture green sand in a non-contact position. do. Therefore, water in the green sand actively evaporates, and the product comes into direct contact with the high-moisture green sand. That is, after the transfer, the mold is effectively cooled, which is effective in shortening the cooling time or reducing the number of cooling lines.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention;
FIG. 2 is an explanatory diagram showing a punch-out state for transferring a mold, and FIG. 3 is an explanatory diagram showing a state in which the mold has been transferred to a cooling flask. FIG. 4 is a layout diagram of a casting line showing a conventional example. 1... Molding lane, 2... Mold making machine, 8... Pouring zone, 9... Cooling lane, 10... Punch-out device, 12... Cooling line, 15... Casting flask for molding, 1
6...Mold, 17...Mold for cooling, 22...Mold release device.

Claims (1)

[Claims] 1. A mold that has been made in a casting flask that is intermittently transferred through a casting line that includes at least a molding process, a pouring process, and a minimum necessary cooling process, and is filled with metal, is placed in a cooling lane that constitutes the cooling process. A method of cooling by cooling to a certain extent and then transferring a cooling line installed separately from the casting line into a cooling flask that is intermittently transferred, the connecting portion of the cooling lane and the cooling line is the transfer position of the mold, and by lowering the punch-out head of the punch-out device placed above this transfer position, the mold in the molding flask falls down and is placed below the molding flask. A mold cooling method that transfers the product into a waiting cooling mold without exposing the casting sand.