JPS631150B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic pouring device that automatically pours metal into a mold.

In recent years, frameless double-sided molds have been widely used in the mass production of castings due to their excellent performance.
FIG. 1 shows an example of a casting manufacturing line using this frameless double-sided mold. In this figure, reference numeral 1 denotes a foundry sand mold (hereinafter referred to as a sand mold), and the sand molds are closely arranged in a line. 2 is a molding machine that makes the sand mold 1; 3 is a piston of the molding machine 2; and 4 is a match plate on the press side that forms the sand mold 1. The sand mold 1 is formed by being pressed by this press side match plate 4 and a fixed match plate which will be described later. Furthermore, the sand mold 1 newly created by the modeling machine 2 is transferred by the piston 3 and added to the row of sand molds 1. At this time, the entire row of sand molds 1 is transferred to the left in the drawing by one sand mold. Next, 5 is a pouring device, and 6 is its pouring port. Pouring device 5
is for pouring molten metal into the sand mold 1, and is generally located at a predetermined distance away from the piston 3, for example, in the figure, the boundary position between the 7th and 8th sand molds from the piston 3 side is the pouring position A. Pour hot water. Since this pouring position A changes for reasons described later, the pouring device 5 is driven by the drive device.
It is configured to be movable in the row direction of the sand mold 1.

Next, the reason why the pouring position A shown in FIG. 1 changes will be explained. FIGS. 2a to 2e are diagrams showing the manufacturing operation of the sand mold 1. FIG. Since the sand mold manufacturing operation and the pouring operation are performed in parallel, a clock representing the time share of the various operations is shown on the left side of each figure to show the relationship between these operations.

In FIG. 2a, 15 is a fixed match plate, which is rotatable around a fulcrum B. In FIG. 17 is a stopper for fixing the fixed match plate 15, and is movable downward. 16 is a casting sand hopper provided with sand for molds (hereinafter referred to as casting sand), and 16a is an on-off valve at its discharge port.

In the above-described configuration, when the on-off valve 16a is opened as shown in FIG. 2b, casting sand is discharged. This casting sand discharge is carried out from time 0 to a time slightly past _t1 . Further, pouring of metal starts at time _t1 at pouring position A shown in FIG. Then the second
As shown in Figure c, the piston 3 is driven leftward in the drawing to compress the casting sand. As a result, the casting sand is solidified and formed into a sand mold 1. The time at this time is _t2 , and the width of the formed sand shape 1 is d.
Then, after the stopper 17 moves downward and the fixed match plate 15 rotates upward, the piston 3
is further driven to the left to bring the formed sand mold 1 into close contact with the rear end of the row of sand molds. The time at this time is _t3 , and at this time, pouring at pouring position A is completed. Further, the piston 3 is driven to the left to transfer the row of sand molds 1 to the left. Since the amount of extrusion of the piston 3 at this time is a constant amount, the position C of the rear end of the row of sand molds 1 shown in FIG. 2e is always at a fixed position. Further, the time at this time is _t4 , and between this time _t4 and the start time 0, the apparatus returns to the state shown in FIG. 2a, and the same operation is repeated again. Note that one cycle of repetitive motion is generally
It is about 12 seconds.

Now, the casting sand used in the above-mentioned device is sand,
It is a mixture of bentonite, pitch powder, water, etc., and the composition of these ingredients is predetermined to provide various properties suitable for casting. However, when molding sand that has been used once is used repeatedly, the temperature of the repeatedly used molding sand becomes high.
The added moisture tends to evaporate easily, and as a result, the properties of casting sand change during operation. As a result, the amount of casting sand discharged as shown in Figure 2b changes,
Furthermore, the packing density of the molding sand due to compression shown in FIG. 2c also differs. This is the cause of the variation in the width d of the formed sand mold, that is, the cause of the variation in the pouring position A.

On the other hand, FIG. 3 is a diagram showing the positional relationship between the pouring spout 6 and the sprue 10 of the sand mold 1. As shown in the figure, there is no problem if the center lines of the pouring port 6 and sprue 10 match when pouring, but if the center lines do not match, a vortex will occur at the sprue cup 11. This changes the pouring conditions, adversely affecting the quality of the cast product, and if the center line is greatly misaligned, the molten metal may flow out of the sprue cup 11, creating a dangerous situation for workers.

Therefore, it is necessary to accurately align the pouring position A of the pouring device 5.

As a method for accurately aligning the pouring position A, a method described in Japanese Patent Publication No. 52-21635 is known.

This method involves placing marks at predetermined positions on each mold and detecting the marks to align the pouring position of the pouring device with the sprue, but this method has the following drawbacks.

If a mark is placed on a weak sand mold, problems may occur in identifying the mark due to localized sand crumbling.

When the pouring operation ends and you move on to the next pouring operation,
To detect the next mark, a new sand mold is added to the column, the column is pushed out, and one must wait until the column stops. That is, even if pouring ends at time _t3 shown in FIG. 2d, the pouring device starts moving to find the next pouring position A from time _t4 . Therefore, the time available for movement is from time t ₄ to time t ₁ of the next cycle.
There is only a short amount of time until (the time to start pouring water).
Therefore, when the casting speed is increased, it becomes impossible to detect the mark during the period from t ₄ to t ₁ , and a situation occurs in which the start time of pouring in the next cycle is delayed. In other words, it was not possible to increase the casting speed.

In view of the above-mentioned circumstances, the present invention provides an automatic pouring device that does not use any marks or the like to identify the pouring position and is capable of extremely high casting speed. The width of the molten metal is measured and stored sequentially, and the next pouring position is controlled based on the memorized results.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a block diagram showing the configuration of an embodiment of the present invention. In this figure, 30 is a potentiometer, the slider of which is interlocked with the piston 3 via a gear or the like. Further, a constant voltage power supply 31 is connected between both fixed terminals of the potentiometer 30. A voltage corresponding to the displacement of the piston 3 is output from the sliding terminal of the potentiometer 30, and this voltage is supplied to the measurement circuit 32.
The measuring circuit 32 measures the width d of the formed mold based on the displacement of the piston 3 during the compression of casting sand shown in FIG. 2c. The output data (width d data) of the measurement circuit 32 is stored in _M1 of the memory 33.
stored in the area. The memory 33 is provided with seven areas _M1 to _M7 , and when data is supplied from the measurement circuit 32 to the _M1 area, the data stored in the _M1 area is transferred to the M2 area and then to the _M2 area. The data stored in area ₂ is shifted to areas with larger addresses, such as area _M3 , and so on.
Additionally, the data stored in the _M7 area will be erased. That is, in the state shown in FIG. 5a, _d7 is in area _M1 , _d6 is in area _M2 , d5 is in area _M3 , _d4 is in area _M4 , _d3 is in area _M5 , and _d6 is in area _M6 . d ₂ and d ₁ are each stored in M ₇ areas. The arithmetic control unit 34 calculates the sum of the data in M ₁ to M ₇ (this sum is the fifth
This corresponds to the distance between position C and pouring position A shown in Figures a or b. ), and its output signal is supplied to the drive mechanism 35. The drive mechanism 35 drives the automatic pouring device 5 based on the supplied signal and controls its position.
Note that 36 is a data bus.

Next, the operation of this embodiment will be explained.

The distance ₁ between the position C and the position A shown in FIG. 5a is indicated by the sum of the data _d7 to _d1 stored in _M1 to _M7 , respectively, as described above. That is, it is expressed by the following equation.

₁ = d ₁ + d ₂ +...+d...(1) Therefore, the drive mechanism 35 is at a distance from position C.
The position of the automatic pouring device 5 is controlled so that the pouring port 6 comes to position ₁ .

When the pouring at the above-mentioned position is completed and the next sand mold 1 is pushed out as shown in FIG. 5b, the distance ₂ between the position C and the pouring position A is expressed by the following equation.

₂ = d ₂ + d ₃ + ... + d ₈ ... (2) Therefore, the drive device 35 is at a distance from position C.
The position of the automatic pouring device 5 is controlled so that the pouring port 6 comes to position ₂ .

Now, in this embodiment, the time when the next pouring position A of the automatic pouring device 5 can be known is the time when the measuring circuit 32 measures the width d of the newly formed sand mold, so as shown in FIG. It is time _t2 shown in c.
Therefore, the time at which the automatic pouring device 5 can start moving to the next pouring position A is the time when the previous pouring ends, that is, time _t3 shown in FIG. 2d. That is, in this embodiment, the time available for moving the automatic pouring device 5 is a sufficiently long time from time t ₃ to time t ₁ . As a result, casting speed can be increased and high productivity can be obtained. Further, since no marks or the like are provided on the sand mold 1, there is no fear of mark detection errors due to localized sand displacement.

Further, in the arithmetic control section 34, the difference between distance ₁ and distance ₂ is calculated, for example, by the calculation d ₁ - _{d 8} , thereby calculating the distance Δd shown in FIG. 5, and based on this distance Δd. The position of the automatic pouring device 5 may be controlled by the automatic pouring device 5.

As explained above, according to the present invention, the width of the mold to be formed is measured and stored sequentially, and the next pouring position is controlled based on the memorized results, so that the pouring position can be controlled. Be sure, and
Since the casting speed can be increased, high productivity can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the configuration of a general casting production line, FIGS. 2 a to e each show the manufacturing process of the sand mold 1 shown in FIG. 1, and FIG. 3 shows the pouring spout 6 and sprue 10. FIG. 4 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 5 is a diagram for explaining position control of the spout 6 in the same embodiment. 30... Potentiometer (measuring means), 31
. . . Constant voltage power supply (measuring means), 32 . ).

Claims (1)

[Scope of Claims] 1. In an automatic pouring device used in a system in which a sand mold formed by a press is sequentially extruded to form a line, a measuring means for measuring the width of the sand mold from the press amount in the press, and a measuring means for measuring the width of the sand mold from the press amount in the press, and a memory for sequentially storing width data output by the means;
The next pouring position is calculated from the width data in this memory, and the new sand mold formed by the press is poured into the next pouring position obtained by the calculation before being pushed out to the line. An automatic pouring device comprising: a pouring position control means for starting the movement of the pouring device. 2. The calculation in the pouring position control means sets the pouring position to the Nth (N is any integer) and the (N+
1) In the case of setting at the boundary position of the th sand mold, after the width data of the newly formed sand mold is supplied to the memory, add the width data from the latest width data to the Nth width in the memory. 2. The automatic pouring device according to claim 1, wherein the position corresponding to the addition result from the starting end of the line is determined as the next pouring position. 3 The calculation in the molten metal pouring position control means determines the molten metal pouring position from the Nth (N is an arbitrary integer) to the (N+
1) When set at the boundary position of the sand mold, from the difference between the Nth width data in the memory during pouring and the new width data of the sand mold supplied to the memory after pouring. 2. The automatic pouring device according to claim 1, wherein the calculation is to calculate a moving distance from the current pouring position to the next pouring position.