JPS6217146Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disintegration and elution device for sand mold cores used after die casting, such as cylinder heads in internal combustion engines.

When casting a cylinder head, a sand mold core is usually assembled inside the mold cavity to form internal exhaust and intake passages, and then a sand mold core is cast inside the cylinder head casting (workpiece). The child is being disintegrated and extracted.

Figures 2 to 6 show such a workpiece, and the second
The figure is a plan view, Figure 3 is a front view (direction of arrow C in Figure 2), Figure 4 is a sectional view taken along line 4-4 in Figure 2, Figure 5 is a sectional view taken along line 5-5 in Figure 2, FIG. 6 shows a composite view of FIGS. 4 and 5. In the figure, numeral 50 indicates a cast cylinder head of a two-cylinder gasoline engine, numeral 51 is a cylinder head portion, and numerals 52 and 53 are sprues, which will be cut off later. The inside of such a cylinder head is provided with through holes such as an exhaust passage, an intake passage, and a water jacket hole for circulating cooling water, but these passages are usually formed using a mold having a cavity shaped like the cylinder head. A sand mold core 54 having the same shape as the exhaust passage and a sand mold core 55 having the same shape as the intake passage as shown in FIG.
A sand mold core 57 is provided with an end portion 56 forming a plurality of small holes for communicating with jacket holes (not shown) provided in the cylinder body to be joined to the side, and forming a water jacket hole in the cylinder head. The sand mold cores 54 and 55 are assembled in a predetermined position without contact with each other (see Figs. 4 and 6), and after the molds are clamped, the sand mold cores are cast by a predetermined die casting method, and then the sand mold cores are disintegrated from the workpiece. and remove it.

By the way, there are generally dry and wet types of sand mold cores as described above, and the former requires the use of organic solvents when removing from the workpiece, and generates a large amount of dust, resulting in lower work costs and handling. There are some difficulties.

On the other hand, the wet type is generally water-soluble and contains water glass, and has the advantage that it can be easily eluted by immersing it in hot water and vibrating it.

Traditionally, the method that has actually been used to elute this type of water-soluble core is to first immerse the cast workpiece in hot water to improve its collapsibility, and then spray hot water to disintegrate the core. It is eluting. A specific disintegration and elution device is configured such that a hot water tank is provided below, hot water is sucked up from the hot water tank by a predetermined pump, and the hot water is sprayed onto the workpiece, especially the core, through a spray pipe connected to the pump. are doing.

However, since such conventional devices circulate and use hot water from a hot water tank, disintegrated sand is likely to be sucked into the pipe. Generally, relatively large sand particles are removed from the hot water tank using a discharge means such as a net, but relatively small sand particles are easily sucked into the pipes together with the hot water and clog the pipes.

In addition, the spray pipes extend close to the workpiece, and this type of work involves mainly manual labor, so there are disadvantages such as the risk of burns if the hot water remaining in the pipes, which is usually around 90°C, comes into contact with the human body, and poor workability.

In view of these drawbacks, the present invention aims to eliminate clogging of pipes in the above-mentioned disintegration and elution apparatus, and also to provide a core disintegration and elution apparatus that improves workability and prevents dangers associated with the work. This is the purpose.

In order to achieve the above object, the present invention includes a hot water tank provided below, a workpiece mounting table provided above this, and a nozzle located above the workpiece mounting table that moves up and down and faces the core when lowered. A main body configured with a cover provided with a pump, a pump for sucking hot water from the hot water tank, an air pump for supplying air, and a three-way switching valve for communicating the pump, the air pump, and the nozzle, respectively, It is characterized by being configured so that air and hot water can be selectively supplied to the nozzle side by switching a three-way switching valve.

A preferred embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing the overall structure of a core disintegration and elution device 1 according to the present invention.

First, 2 in the figure is the main body of the device, which has the function of disintegrating and dissolving the sand mold core from the workpiece placed inside. Its structure includes an outer cover 9 shown by a phantom line on the outermost side, and shields all sides except necessary openings such as a workpiece inlet and an outlet. Outer cover 9
A hot water tank 10 is provided at the bottom inside the tank, and a large amount of hot water is stored therein, and the temperature is always maintained at about 90°C using a heater (not shown). Above this hot water tank, a workpiece mounting table 12 is installed, for example, at a height that makes it easy to take in the workpieces, and there is also a workpiece mounting table 12, for example, a wire mesh, a set lattice, etc., through which the hot water from above and the sand blocks that have collapsed and eluted can pass. It is formed in Above this workpiece mounting table 12 is a cover 15 that can be raised and lowered by a cylinder 16 etc. installed on the head of the outer cover 9.
The shape of the cover 15 is, for example, a rectangular parallelepiped with an opening at the bottom, and the size is such that it can appropriately cover the workpiece placed on the workpiece mounting table 12 when lowered. Also,
A nozzle 1 for spraying hot water is provided on the side plate of the cover 15.
8, 19, 20, and 21 are at predetermined positions, that is, when the cover 15 is lowered with respect to the workpiece 8d placed on the workpiece mounting table 12.
A plurality of them are arranged at positions facing the sand mold in the opening portion that appears outside the workpiece as explained in the figure. Note that the nozzle diameter is approximately 3 mm.

Further, a pump 3 for sucking hot water is connected to the hot water tank 10 via a pipe 38. One end of a pipe 39 is connected to the output side of the pump 3, and the input side of a solenoid valve 36, which is opened and closed by a solenoid 37, is connected to the other end to control the flow of hot water. Further, one end of a pipe 35 is connected to the output side of the electromagnetic valve 36, and the other end is connected to one input end of the three-way switching valve 5, thereby forming a hot water flow path to the three-way switching valve 5.

The three-way switching valve 5 is fixedly provided at a predetermined position above the device main body 2 as in the embodiment, and has two input ends and one output end, and the input can be selectively switched by, for example, a solenoid 33. Has a valve function. One input end is connected to a pipe 35 from the pump that supplies hot water, and the other input end is connected to a steel pipe 34 with a diameter of about 10 mm, for example.
The air pump 4 is connected via. Further, at the output end, one end is closed and a plurality of relatively small diameter pipe ports 32a are arranged at predetermined intervals on the longitudinal outer wall.
Supply pipes 32 having 32b, 32c, . . . are connected horizontally.

On the other hand, the nozzle 1 provided on the cover 15 described above
Steel pipes 22, 23, 24, 25, etc. with a diameter of about 20 mm are connected to 8, 19, 20, and 21,
It extends vertically upward. Note that since the steel pipes 22, 23, 24, 25... are provided through holes provided on the top surface of the head of the outer cover 9, the vertical portions of the pipes have at least a stroke length for the cover 15 to move up and down. There is.

And the steel pipes 22, 23, 2
Pipe ports 32a, 32b, 32c provided in the supply pipe 32 located at the upper end of 4, 25...
... are connected by heat-resistant rubber hoses 27, 28, 30, 31... to form a predetermined flow path. In addition,
The pipe ports 32a, 32b, 32c... are oriented upward as shown in FIG.
7, 28, 30, 31... are installed in an inverted U shape, and in this case, the height from the top of the rubber hose, which is the bending point, to the nozzle is set to about 1.5 m.

In addition, an endless sand conveyor 13 using rollers 14 is installed in the hot water tank 10 as schematically shown by the imaginary line in FIG. Discharge the sand blocks inside to the outside of the tank. Note that the reference numeral 40 in the figure indicates the cover 15.
an operation panel including a start/operation switch or lamp for lifting and lowering the motor, operating the electromagnetic valve 36, etc.;
Further, numeral 41 indicates a workbench.

Although the above constitutes the main part of the disintegration and elution apparatus according to the present invention, conveyors 6 and 7 are provided before and after the main body 2 of the apparatus as ancillary devices, and are continuous with predetermined processes before and after the apparatus main body 2. In addition, work 8 in the figure
a, 8b, and 8c are the workpieces sent from the previous process, 8d is the workpiece set in the device body, and 8c is the workpiece sent from the previous process.
e indicates the workpieces whose cores have completely disintegrated and eluted.

Next, the operation of the core disintegration and elution device having such a configuration will be explained.

First, the works 8a, 8b, and 8c, which have been immersed in hot water in the previous step to be easily disintegrated, are automatically conveyed sequentially in the direction of arrow A by the conveyor 6.

Then, the workpiece (8c in the figure) that has flown in front of the apparatus main body 2 is placed from a predetermined intake port into the inside of the apparatus main body 2, that is, on the workpiece mounting table 12 inside the outer cover 9, at a predetermined position and in a predetermined direction. do. Note that the cover 15 is raised.

Next, turn on the start switch on the operation panel 40.
This ON operation lowers the cover 15, the workpiece (8d in the figure) is housed inside the cover 15, and each nozzle faces the exposed part of the sand mold core to be eluted. Next, hot water is injected from each nozzle. At this time, the three-way switching valve 5 is operated to supply hot water from the pump 3 side, and the solenoid valve 36 is also opened, and the hot water in the hot water tank 10 is injected by driving the pump 3. pipe 38, pump 3, pipe 39, solenoid valve 36, pipe 35, three-way switching valve 5, supply pipe 3
2. Heat-resistant rubber hoses 27, 28, 30, 31...,
It passes through steel pipes 22, 23, 24, 25..., nozzles 18, 19, 20, 21... in this order, and hot water (about 90°C) is spouted from the nozzle opening at a predetermined pressure (about 5 kg/cm ² ). . Then, such an operation is maintained for a predetermined period of time, and the core is disintegrated by the hot water and eluted by the hot water, and the hot water and the eluted sand block fall into the hot water tank 10 below.

When this operation is completed, the three-way switching valve 5 is switched to the other input end to supply air to the nozzle side.
That is, an air pump 4, a steel pump 34, a three-way switching valve 5, a supply pipe 32, and a heat-resistant rubber hose 2.
7, 28, 30, 31..., steel pipe 22,
23, 24, 25..., nozzles 18, 19, 20,
Air from the air pump passes through in the order of 21...,
Air flows from the nozzle opening to a specified pressure ( ^{approximately} 5Kg/cm2)
gushes out. Due to the action of this air, hot water remaining in each pipe, hose, etc. from the three-way switching valve 5 to the tip of the nozzle can be removed. Incidentally, the sand lumps and sand grains that have collapsed and eluted as described above fall into the hot water tank 10, but relatively large sand lumps are removed from the tank 10 by the sand extraction conveyor 13. Relatively small sand grains that cannot be removed are sucked up by the pump 3 along with hot water for jetting and remain inside the pipe, etc., but these remaining sand grains can also be removed at the same time by the action of the air.

However, if the above operations are completed, cover 1
5 rises. Then, the operator takes out the workpiece from which the sand mold core has been removed from the outlet and transfers it to the conveyor 7.
Once placed on top, the workpiece (8e in the figure) is sent to the next process in the direction of arrow B.

Note that in the above-described operations, all operations of the apparatus, in addition to loading and unloading workpieces into the apparatus main body 2, are performed by sequence control using a timer or the like.

Furthermore, the configuration and operation of each part are not limited to the embodiments, and various known techniques can be applied. Forming the work into a mesh shape and introducing the work into the device main body 2,
It is also possible to completely automate the manual work of extraction, and this does not deviate from the scope of the present invention.

As is clear from the above description, when the core disintegration and elution device according to the present invention disintegrates and elutes the core in the workpiece, the hot water remaining inside the pipe etc. Since sand is removed, sand clogging due to long-term use is prevented. Furthermore, since such work can be performed automatically in a short amount of time, an increase in the number of work steps is not a problem, and furthermore, even when hot water is repeatedly used, it is possible to use the hot water for a relatively long period of time.

Furthermore, since the nozzle is installed in the cover that covers the workpiece, automation is possible, and there are no hot water splashes, which significantly improves workability and safety. be.

Although the present invention has been described in the case of being applied to a cylinder head casting for an internal combustion engine, it can also be applied to various other works using sand mold cores.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view showing the overall configuration of a core disintegration and elution device;
Figures 2 to 6 show the workpiece (cylinder head casting) from which the agglomerate is eluted. Figure 2 is a plan view, Figure 3 is a front view (in the direction of arrow C in Figure 2), and Figure 4 is a 4-4 line sectional view in Figure 2, Figure 5 is 5-5 in Figure 2
The line cross-sectional view, FIG. 6, is a composite view of FIGS. 4 and 5. In the drawing, 1 is a core disintegration elution device, 2 is the main body of the device, 3 is a pump, 4 is an air pump, 5 is a three-way switching valve, 8a, 8b, 8c, and 8d are workpieces, 9 is an outer cover, and 10 is a heating device. water tank, 12 is a workpiece mounting table,
15 is a cover, and 18, 19, 20 and 21 are nozzles.

Claims (1)

[Scope of utility model registration request] The main body consists of a hot water tank provided below, a workpiece mounting table provided above this, and a cover that moves up and down above the workpiece mounting table and has a nozzle at a position facing the core when lowered. and a pump for sucking hot water from the hot water tank, an air pump for supplying air, and a three-way switching valve that communicates the pump, the air pump, and the nozzle, respectively, and the nozzle is controlled by switching the three-way switching valve. A core disintegration and elution device characterized by being configured so that air and hot water can be selectively supplied to the side.