JPH0312984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention provides a shell core coating/cooling device for applying a coating material to the surface of the shell core and cooling it after the shell core is molded. It is related to.

Conventional technology As is well known, in the molding of shell cores, generally
A shell molding method has been adopted in which a core box mold preheated to 300 to 350°C is coated with a thermosetting resin and the coated sand is molded by blowing or other methods.

The core molded using this shell molding method is coated with molding materials such as aggregate and additives on its surface to smooth the casting surface and prevent reactions between the cast metal and the core. The coating is done by a method such as dipping, which utilizes the residual heat of the core from molding.

Immediately after the coated core is coated, workers inspect the shape of the core and load it for the next process. However, the core is at a high temperature due to residual heat after molding and is not cooled down sufficiently, so workers must wear two or three layers of gloves or heat-resistant gloves and handle the hot core with their hands. The problem was that not only was the work environment poor, but work efficiency was also poor.

In order to solve these problems, it is conceivable to place the coated mold core in a predetermined place and cool it, but this is not generally done because of problems such as cost and space.

On the other hand, in order to efficiently cool the core after coating, the turntable is provided with multiple sections in the circumferential direction, and a core loading station is installed at a position corresponding to one of the sections. Conventionally, a device has been used that rotates intermittently according to the angle between each section, and when the rotation stops, sequentially carries high-temperature cores from the carry-in station to the turntable and takes out the cores from the carry-out station. There is.

In operation of this device, in order to maximize the time during which the cores are placed on the turntable, i.e. cooled, it is necessary to It is necessary to provide a core removal station at a corresponding position and to transport the core from the turntable as the turntable rotates.

Problems to be Solved by the Invention As mentioned above, the molded core is at a high temperature (generally 120 to 180°C) due to residual heat, so the molded core must be transported to the turntable. Since it is extremely dangerous to rely on manual labor for the work, it is common for the work to be carried in automatically by a machine. On the other hand, the work of carrying out the core cooled on the turntable from the turntable is generally performed manually in many cases.

By the way, as mentioned above, in a conventional device using a turntable, in order to maximize the time that the core is placed on the turntable (cooling time), the core removal station and the core loading station are separated. If they are placed next to each other, the two stations are in the closest position, which makes the space for carrying out the cores narrower and difficult, and the hot cores that have just been carried in are located nearby. Therefore, there is a problem that the human body of the worker who carries out the manual carrying out work is endangered. In this case, even if we try to automate the unloading work with a machine, the loading station and unloading station are very close to each other, making it difficult to install the machine due to the limited space available, and also to maintain and inspect it. However, it is difficult to apply this method in practice.

Furthermore, the equipment for the next process after cooling the cores is usually placed on the opposite side of the core loading station with respect to the turntable in order to make the entire line straight. Yes, but
In the conventional tarten table for cooling cores as described above, the unloading station is close to the loading station, so the cores that are unloaded at a position close to the loading position must be carried toward the opposite side of the loading position. Therefore, there is a problem in that the amount of movement required to transport the core to the equipment for the next process must be large.

Additionally, there is a problem in that it is not possible to set work lines etc. in a manner that maximizes work efficiency, resulting in poor layout performance and deterioration of work efficiency.

On the other hand, it is also conceivable to provide the carry-out station on the opposite side of the turntable from the carry-in station.
It becomes possible to reduce the amount of movement of the core to the equipment for the next process.

However, in this case, during operation, cores are placed in each section of the turntable that covers approximately half the rotation direction from the loading station to the unloading station.
On the opposite side, each section around half the circumference is always in a state where no core is placed, that is, in an empty state, so only about half of the sections are used at any time, and the space efficiency of the core is reduced. It has to get worse. Moreover, in this case, compared to the case where the unloading station is placed adjacent to the loading station as described above, the core is only placed on the turntable for about half the time, so the core is The cooling time for the core may be shortened, making it difficult to cool the core sufficiently, and in that case, it will have a negative impact on the subsequent work, that is, on the worker's work of carrying out the core.

If the rotational speed of the turntable is reduced in order to prolong this cooling time, the speed at which the core is carried into the turntable will naturally decrease, resulting in a problem of deterioration of work efficiency.

The basic purpose of this invention is to solve the above-mentioned problems, and it improves the space efficiency with a simple structure without impairing workability or layout efficiency. The object of the present invention is to provide a device that can simultaneously and efficiently perform cooling.

Means for Solving the Problems In other words, the present invention includes a turntable that is divided into a plurality of sections in the circumferential direction, and a core carrying-in device, a core coating device, and a core carrying-out device, respectively, at predetermined positions corresponding to the sections. The present invention relates to an apparatus for efficiently coating and cooling a core by rotating the turntable by an angle larger than the angle between adjacent sections.

Specifically, a arranged at equal intervals in the circumferential direction
A turntable having a number of divisions (a≧5), and a turntable having a number of divisions (a ≧ 5),
and a drive device for rotating at an angle of 360 degrees x b/a (where b is an integer that satisfies a>b≧2 and has no common divisor other than a and 1); The position corresponding to any one of the stopped positions is the loading station for the core, and the position corresponding to the loading station or the b-th division from this loading station in the rotational direction of the turntable is It is said to be a coating station where a core coating device is installed.
Furthermore, the c-th point in the rotational direction of the turntable from the loading station (however, c=a-b and c≧
It is characterized in that the position corresponding to the division 2) is a core unloading station.

Furthermore, it is desirable that a cooling device is provided at a position corresponding to at least one section other than the section corresponding to the unloading station.

Effect According to the present invention, the shell core carried into one section of the turntable located at the position of the carry-in station will remain in that position if the position of the carry-in station remains the position of the coating station. When the coating mold is applied at the same time and the coating mold station is located at the b-th section from the loading station, it is rotated along with the turntable by a predetermined angle (360 degrees x b/a) and the coating is applied. It reaches the molding station, stops at the molding station, and applies the molding. In either case, the turntable is further intermittently rotated by the predetermined angle (360 degrees x b/a) each time. During this time, each time the rotation stops, the shell cores are sequentially carried into each section on the turntable at the carry-in station, and a mold is applied at the mold-painting station. When the shell core is first carried in at the carrying-in station and the number of rotations reaches (a-1) times and stops, the first shell core carried in is located at the core carrying-out station. Therefore, the shell core is carried out of the turntable at the carrying-out station by hand or machine. Thereafter, the shell core is sequentially carried out in the same manner at each rotation stop at the carry-out station.

In this way, each shell core carried in at the carrying station is rotated by an angle of 360 degrees x b/a each time with the turntable, and when it has rotated a total of (a-1) times. ,
In other words, the cumulative rotation angle is 360 degrees x b x (a-1)/
When it reaches point a, it will be located at the unloading station and will be unloaded at the unloading station. In the meantime, the mold is coated and cooled.

In the following process, when the number of rotations by the above-mentioned angle after the shell core is first carried in reaches a times, the section into which the shell core was first carried returns to the position of the carrying station again. Then, a new shell core is loaded into the empty section at that loading station position. Therefore, if we consider each section on the turntable, after the shell core is carried into that section (a-1)
When the first rotation stops, the shell core is carried out, and when the subsequent a-th rotation stops, a new shell core is carried in. This means that each section on the turntable always accommodates the maximum number of shell cores, so that the space efficiency of the turntable is at its best.

Also, of the time from when a shell core is carried into a certain section until that section rotates a number of times by the above-mentioned angle and returns to the carrying station, (a-1)
Since the time until the rotation stops (unloading) is used as cooling time, the cooling time is also maximum, and sufficient cooling can be achieved.

Here, if a cooling air blower is provided at a position corresponding to at least one section other than the section corresponding to the unloading station, the shell core can be forcibly cooled and the cooling efficiency can be improved.

In the above description, the number a of sections in the turntable needs to be five or more. a is 5
In the case of a small number of units less than Therefore, if the loading interval is shortened, it becomes difficult to make the cooling time sufficiently long.

On the other hand, if the number b that defines the rotation angle per turn of the turntable together with a is 1, then c=a
-1, the position of the carry-out station is adjacent to the position of the carry-in station (but adjacent in the opposite direction to the rotating direction of the turntable), which causes a problem in the work at the carry-out station. Furthermore, it is meaningless to make the number b greater than or equal to a. Therefore, the number of b was set within the range of a>b≧2. In addition, if b and a have a common divisor other than 1, after the shell core is first carried into a certain category, the shell core is first carried in before the shell cores are carried into all the categories. This means that the filled sections will be returned to the loading station, and in this case, not all the sections will be filled with shell cores. In other words, there will be a segment that is not utilized, which is economically meaningless. Therefore, b and a need to be numbers that do not have a common divisor other than 1.

Further, the mold coating station where the core coating device is arranged is located at the same position as the loading station, or at a position corresponding to the b-th division from the loading station in the rotational direction of the turntable. Here, setting the mold coating station at the same position as the loading station means that the mold can be immediately applied to the shell core that has been transported. Further, setting the coating mold station at a position corresponding to the b-th section from the loading station means that the shell core reaches the coating mold station in the first rotation after loading. By defining the position of the mold coating station in this way, it becomes possible to apply the mold to the shell core at an early stage after it has been delivered.

Furthermore, by setting the position of the unloading station to the c-th position from the loading station in the rotational direction of the turntable, and defining that c as c=a-b, the shell core that is first loaded into a certain section is The number of rotations until reaching the unloading station is (a-1), and therefore, as is clear from what has already been said, all the sections on the turntable are effectively used to maximize the space factor and cool down. This makes it possible to maximize the time. Note that if c (=a-b) is 1, the unloading station will be adjacent to the loading station (adjacent in the rotating direction of the turntable), which will cause difficulties in the unloading operation, so c must be 2 or more. And so.

Embodiments Examples of the present invention will be described below with reference to the accompanying drawings. Note that in this example, a=7,
This is an example in which b=3 and c=a−b=4.

The turntable 1 has a heptagonal shape in plan view, and is provided with seven core holders 2, which are evenly divided and spaced by an angle θ (360 degrees/7) in the circumferential direction. Each child cradle 2 is provided with a partition wall 3 for partitioning it into a rectangular shape.
If the positions corresponding to the core holder 2 are sequentially A, F, D, B, and C in the counterclockwise direction in FIG. 1, then A part is used as a core loading station.
Section B is a mold coating station, and section G is a core unloading station.

A drive device 4 for rotating the turntable 1 is provided below the axis of the turntable 1, and the drive device 4 includes, for example, a rack and pinion for transmitting driving force to the turntable 1. It consists of a hydraulic cylinder (not shown). The drive device 4 is configured to rotate the turntable 1 by a predetermined angle (360 degrees x 3/7) per turn in the direction of arrow R, and for each rotation, the turntable 1 is rotated by a known positioning device (not shown). ) is used for positioning.

A shell core 8 after molding is located outside the turntable 1 and close to the loading station.
An unloader 5 is disposed for moving the product to the loading station, and the unloader 5 includes an elevating cylinder 5a, a swing motor 5b disposed on the cylinder 5a, and a swing motor 5b that receives the rotational force of the swing motor 5b. A holding portion 5d for holding the shell core 8 is provided at the tip of the rotating arm 5c.

Further, the mold coating station is provided with a dipping tank 6 in which a mold coating material is stored so as to be located below the core holder 2. It is made movable in the vertical direction by a sill 7.

Next, the operation of the embodiment of this invention will be explained.

The molded shell core 8 held by the holding portion 5d of the unloader 5 is moved to the carry-in station A and placed on the core holder 2. Next, the turntable 1 is rotated for the first time in the direction of arrow R (360 degrees x 3/3) by the drive device 4.
7), and the core 8 is placed in the mold station B. Furthermore, the dipping tank 6 provided in the mold coating station B is raised by the air cylinder 7, and as a result, the lower surface of the core 8 is dip coated with the mold coating material stored in the dipping tank 6. At this time, the next core 8 is subsequently placed in the core loading station.

The above operation is performed every time the turntable 1 rotates by (360 degrees x 3/7), that is, every time it rotates once, and in the sixth rotation, the first core 8 is arranged at the position of the carry-out station G, and is carried out of the turntable 1 by, for example, human power. By repeating such operations, the core is carried in, coated, cooled, and carried out continuously.

Here, since the carry-out station G is located at a substantially opposite position to the carry-in station A, the amount of movement of the shell core for the next process is small, and the layout is good.

Further, in this embodiment, the coating station B is located before the carry-out station G, so that the quality of the coating mold can be easily observed and maintained during operation.

In order to efficiently perform the above-mentioned processing of the shell core, the time required for molding the core must match the above-mentioned processing time, that is, the time interval between each rotation of 360 degrees x b/a angle. It is desirable to do so.

Generally, it takes about 2 minutes to mold a shell core with a simple shape, and in the above example, the turntable is
The core is cooled for 2 minutes x 6 = 12 minutes because it rotates 360 degrees x 3/7 times six times. The shell core after molding is generally at a high temperature of 120 to 130°C, and was cooled to 50 to 60°C by the apparatus of this example at the time of delivery.

FIG. 3 is a schematic diagram of a cooling device 9 for forcibly cooling the shell core, and this cooling device 9 is arranged at a position corresponding to a desired section other than the section corresponding to the unloading station. 9a is a blower, and a cooling air outlet 9b is connected to this blower 9a.
are arranged so as to face the lower surface of the shell core 8 placed in each section 2 of the turntable 1. Furthermore, an exhaust hood 9c is arranged above the core 8 to collect dust and the like.

With this cooling device 9, cooling air can be forcibly blown onto the shell core to efficiently cool the core.

In addition, cores with complex shapes require extra time to cool down, so in such cases, increase the number of sections on the turntable and increase the number of revolutions from loading to unloading the core. good.

For example, if the number of sections is 9 or 11, the turntable should only be rotated by (360 degrees x 4/9) or (360 degrees x 5/11) each time.
Furthermore, the cooling device can be provided as desired.

In this embodiment, a rack pinion and a hydraulic cylinder are used as the drive device, but the invention is not limited to this. It is possible to appropriately change to known means such as a motor.

Moreover, although an unloader was used as a device for moving the shell core after molding at the carrying-in station, this can also be changed to other known means as appropriate.

Effects of the Invention As described in detail above, according to the present invention, the shell core after molding can be efficiently coated and cooled, and all sections within the turntable are always effectively utilized. , the overall space efficiency of the shell core is the best, and
The cooling time is maximized, and since the unloading station is not adjacent to the loading station, even if the core unloading operation is performed manually using input, it can be done safely and easily, and space constraints are avoided. This makes it possible to mechanize the carrying out work, and furthermore, the overall structure is simple, so equipment costs can be reduced.

Furthermore, if a cooling device is provided at a position corresponding to at least one section other than the section corresponding to the unloading station, the core can be cooled more efficiently.

In addition, the position of the core unloading station can be changed without affecting the core coating and cooling operations as long as the conditions of the present invention are followed.
Therefore, it is possible to install the unloading station almost on the opposite side of the loading station, but in that case, it is possible to facilitate efficient layout of the entire line and to improve workability.

Furthermore, like the unloading station, the position of the mold coating station can be changed, and if this mold coating station is placed in a position that is not close to the loading station, it is possible to easily observe the mold coating status of the shell core. Furthermore, maintenance becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention;
FIG. 2 is a front view, and FIG. 3 is a schematic diagram of the cooling device. 1... Turntable, 4... Drive device, 6...
...dipping tank, 8...shell core, 9...cooling device.

Claims (1)

[Scope of Claims] 1. A turntable having a number of equal sections in the circumferential direction (however, a≧5), and a turntable having a number of equal sections in the circumferential direction, and a direction in which the turntable is rotated 360 degrees x b/a (where b is
It is an integer that satisfies a>b≧2 and has no common divisors other than a and 1. ), and the position corresponding to any one of the stopped sections is a loading station for the core, and the position of the loading station or from this loading station is b in the direction of rotation of the turntable
The position corresponding to the 1st division is the coating station where the core coating device is located, and the cth position from the loading station in the rotational direction of the turntable (where c=a-b) and c≧2)
A shell core coating mold characterized in that the position corresponding to the division is the core unloading station.
Cooling system. 2. The shell core coating/cooling device according to claim 1, wherein a cooling device is provided at a position corresponding to at least one section other than the section corresponding to the unloading station.