JPS5922619B2 - Processing method and equipment for sprue system in mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for treating a sprue system in a mold, in which the runners and weirs are broken and divided into small parts in the mold after pouring and prior to the disassembly process.

Conventionally, in the casting process, the process of separating the sprue system consisting of sprues, runners, and weirs from the casting was carried out by vibration, shock, cutting, fusing, etc. after cooling and removing some sand after the disassembly process. Nun.

However, in this method, the separated sprues and runners remain bent as they were cast, requiring a large space for storage, and at the same time, if they are to be remelted as waste pig iron, they cannot be put into the melting furnace. A situation arises.

Additionally, when using automatic cut-out equipment or automatic weighing equipment prior to charging material into the melting furnace, the sprues and runners may become entangled with each other or become clogged at the cut-out opening, making them unusable. In order to reduce the size to smaller sizes, it had to be cut into smaller pieces using a hammer, shear press, cutting machine, fusing machine, etc., which required additional equipment or work space.

Furthermore, when remelting waste pig iron in an electric furnace, it is desirable that no sand adhere to it in order to prevent an increase in the amount of slag, but in the case of rotary shot blasting, the sprue and runners are bent. If they are all in one piece, the shot will not hit the entire surface, making it impossible to perform satisfactory polishing, and
In the shot chamber, the sprue, runner, product section, etc. become entangled with each other, causing problems such as clogging at the exit of the shot chamber.

In addition, in the case of ductile iron castings, which have been increasing in recent years, ductile cast iron is not only strong but also has thick weirs, so separating the runner from the casting is not reliable due to vibrations or shocks from falling, and the final Manual hammering, cutting,
It requires work such as fusing, but such work is not only hard labor, but also involves high heat and dust, posing a major problem in production.

Furthermore, after the disassembly process, accurate positioning is required to automate sprue, runner folding, and weir folding, but in the case of multiple pieces, the arrangement of sprues, runners, and castings may become complicated. Because of the large number of pieces, the work after the disassembly process was extremely difficult.

Particularly after the stripping process, the sprues and runners could break or the castings could separate, making it almost impossible to automate the folding of the sprue system.

From this point of view, a weir folding method and device are particularly developed in which a weir folding tool is pressed against or collides with the casting held in the mold after casting and before demolding to remove sprues, risers, weirs, etc. It was disclosed in Japanese Patent Publication No. 18427/1983.

However, with the above method and device, there is no support member to support the casting, so even if the weir breaking tool is pressed against or collides with the weir, the casting only moves within the mold and the sprue, riser, weir, etc. The disadvantage is that it is not completely removed.

This invention has been made in view of the above points, and after pouring and prior to the disassembly process, after inserting supporting members into the mold that support the sprue and runner from above and below while stably holding the mold,
The above-mentioned conventional problems are solved by providing a method and apparatus for treating a sprue system within a mold, in which a runner pressing member is inserted and the runner is pressed to divide the sprue system and separate it from the casting. That is.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, 1 is an upper fixed frame that supports the upper structure of the apparatus, 2 is a pair of upper and lower guide rollers attached to the upper fixed frame 1, and 3 is a flask that holds a mold 4. , is stably held by the upper fixed frame 1 via guide rollers 2, and its position in the traveling direction is determined by a positioning device (not shown).

The flask 3 consists of an upper frame 3a and a lower frame 3b, and the mold 4 consists of an upper mold 4a and a lower mold 4b made of sand, and has a sprue 5 inside.
．． Hot water path 6. A weir 7° casting 8 is formed.

These plan views are shown in Figure 2.

9.10.11 is the first frame fixed vertically to the fixed frame 1. Second. The first cylinder 9 is a third cylinder, and the first cylinder 9 operates a pressing plate 12 that presses the mold 4 from above up and down, and the second cylinder 10 is a runner pushing rod that penetrates the suppressing plate 12 and enters and exits the mold 4. 13 up and down, the third cylinder 1
Reference numeral 1 denotes a sprue press rod 1 that penetrates the press plate 12 and presses the sprue.
Operate 4 up and down.

15 is a lower fixed frame that supports the lower structure of the device;
6 is a fourth cylinder fixed perpendicularly to the lower fixed frame; 17 is a movable frame attached to the fourth cylinder 16; it moves up and down guided by guide rollers 19; Support plate 1 that supports the lower surface of
8 is fixed.

20 and 21 are the fifth parts fixed vertically to the movable frame 17;
．． The fifth cylinder 20 is the sixth cylinder, and the fifth cylinder 20 is the support plate 18.
The runner support rod 22 that supports the vicinity of both ends of the runner 6 from below through the through hole 18a (see FIG. 3
The middle support plate 23, which supports the middle part of the lower surface of the mold 4, is moved up and down.

In FIG. 1, reference numeral 24 denotes an extrusion device for feeding the castings taken out onto the support plates 18 and 23 into a shakeout machine 25.

The operation of the apparatus constructed in this way will be explained with reference mainly to FIGS. 4 to 6.

Now, the poured mold is transported into the processing equipment and the first and second
From the state stopped at the fixed position shown in the figure, the first cylinder 9 operates, the press plate 12 presses the upper surface of the mold 4, the fourth cylinder 16 operates, the movable frame 17 rises, and the support plate 18 Supports the lower surface of the mold 4.

As the movable frame 17 rises, the sixth cylinder 21 also moves, so the middle support plate 23 remains on the same plane as the support plate 18.

FIG. 4 shows this state.

Next, the third cylinder 11 is activated, the sprue press rod 14 enters the mold 4 and presses the top surface of the sprue 5, the fifth cylinder 20 is activated, and the runner support rod 22 enters the mold 4. Then, both ends of the runner 6 are supported respectively, and the state shown in FIG. 5 is reached.

Further, from this state, as shown in FIG. 6, the second cylinder 10 is activated, and the runner pushing and breaking rod 13 enters the mold 4 to press and fold the runner 6, and at the same time, the sixth cylinder 21 is activated. The middle support plate 23 is lowered to reduce the resistance when pushing and folding the runner.

At this time, the position of the casting 8 does not change, so if the runner 6 breaks, the runner will be further extended by the runner pushing and breaking rods 13 using both ends supported by the two runner support rods 22, 22 as fulcrums. As it rotates while being pushed down, the weir 7 (see FIG. 1) receives a twisting moment and twists, and the runner 6 is separated from the casting 8.

When the pressing and folding of the runner 6 is completed, the second. Third. 4th゜5th. Sixth each cylinder 10. IL16, 20°21 is activated and the runner pushing bending rod 13. Hot water pressure rod 14° movable frame 17.
Runway support rod 22. The middle support plates 23 return to their original positions.

Next, the first cylinder 9 is activated, the press plate 12 enters the flask 3, and the mold 4. Sprue 5. Hot water path 6. Weir 7 and casting 8
After being extruded and falling onto the support plate 18.23, the extrusion device 24 shown in FIG. Hot water path 6. Weir7.
The crushed mold 4 containing the casting 8 is fed into a shakeout machine 25.

In the above embodiment, the pressing plate 12 may be omitted, and the middle support plate 23 may be cut out from the beginning.

In addition, if a small protrusion is provided in a part of the mold 4 that forms the runner 6, and a notch is provided at a predetermined position of the runner 6, the break position can always be checked when the runner is pressed. It can be kept constant.

As can be seen from the above, according to the present invention, the sprue system is divided within the mold and separated from the casting prior to the disassembly process after pouring, so the sprue system before cleaning and the runner There is no need for a removal process, and the equipment and work space required for it can be saved.

When rotary shot blasting is performed, there is no internal obstruction, and the sprues and runners can be thoroughly cleaned as they are, eliminating the adhesion of sand and reducing the amount of waste that would otherwise be redissolved. It also saves energy because the amount of waste is reduced.

Furthermore, even in the case of multi-cavity molding, the positions of the sprue, runner, and casting can be kept constant, making it possible to automate the sprue, runner folding, and weir folding.

Furthermore, since the sprue system such as the sprue and runners are separated by pressing and folding in the mold at a high temperature of 500°C to 800°C, the energy required for pressing and folding is extremely small even taking into account the resistance of the sand mold. Finish.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2a is a side view thereof, Fig. 3 is a plan view showing the relationship between sprues, runners, weirs and castings, and Fig. 3 is Fig. 2 FIGS. 4 to 6 are side views similar to FIG. 2, showing various operating states of the device. 1... Upper fixed frame, 3... Casting flask, 4... Mold, 5... Sprue, 6...
... runner, 7... weir, 8... casting,
12... Pressing plate, 13... Runway pushing bending rod, 14... Sprue gate pushing rod, 15... Lower fixed frame, 18... ...Support plate, 22...
... Runway support rod, 23 ... Middle support plate.

Claims (1)

[Scope of Claims] 1 After pouring and prior to the dismantling process, the mold is stably held by supporting at least the bottom surface of the mold, and then the sprue is pressed from above in the mold, and the vicinity of both ends of the runner is pressed from below. support,
A method for treating a sprue system in a mold, characterized in that by pressing the middle part of the runner, the runner is bent and the weir is twisted. 2. A supporting member that supports at least the lower surface of the mold to hold the mold stably; a sprue pressing member that enters the mold from above and presses the sprue; and a sprue pressing member that enters the mold from below and presses the runner near both ends. and a sprue that enters into the mold from above and presses the runner at the middle part of the two runner support members to break the runner and twist the weir. A sprue system treatment device inside the mold, which consists of a pressing member.