JPS61153187A - Washing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning method, and more particularly, the present invention relates to a cleaning method, and more particularly, the present invention relates to a cleaning method that sequentially changes the flow direction of a cleaning liquid injected into a workpiece and injects compressed fluid from a predetermined location into the workpiece. The present invention relates to a cleaning method for effectively removing residual foundry sand and cutting debris generated when cutting a workpiece to the outside.

A cast molded product such as a cylinder throat that constitutes an engine part is provided with a cast hole or a hole that communicates the inside of the product with a cylinder protrusion by cutting. Therefore, molding sand and cutting debris may remain inside the cylinder throat, and it is desirable to effectively remove this. For this reason, cleaning devices are generally employed in the automobile industry for the purpose of automatically removing foundry sand and cutting waste from relatively large workpieces such as cylinder blocks and cylinder heads.

This type of cleaning device is composed of a liquid cleaning device and an air blowing device. That is, a line is extended from the cutting device on the upstream side to the downstream side, a tunnel mechanism is arranged along this line, and the liquid cleaning device and the air blow device are separated for a predetermined period inside the tunnel mechanism. They are arranged alternately.

Therefore, the workpiece, which has foundry sand and chips from the cutting process attached thereto, is introduced into the tunnel, and first, the liquid cleaning device is energized. As a result, the foundry sand and cutting debris are washed away, and then air at a predetermined pressure is ejected from the air blowing device to the workpiece that has just reached the air blowing device. This will blow away sand and cuttings.

Therefore, in this case, the liquid cleaning device and the air blowing device are each provided with a plurality of nozzles that eject fluid air to the workpiece.

By the way, in the conventional apparatus as described above, cleaning of a workpiece having a hole inside thereof, such as a cylinder head or a cylinder block, is performed by spraying a cleaning liquid at a predetermined pressure from the nozzle toward the workpiece, using so-called pressurized liquid. This is generally done through impact.

However, according to this cleaning method, the cleaning effect of the machined holes and the machined surface on the outer surface of the workpiece is extremely excellent, and therefore,
Cutting debris and the like can be almost completely removed, but the pressurized liquid cannot reach the inside of the holes. Therefore, cutting debris and the like adhering to the interior of the holes are not subjected to impact by the pressure fluid, and are simply removed from the holes as the pressure fluid flows down as a natural flow. Therefore, there is a risk that cutting waste and the like may remain inside the holes, and it has been pointed out that there is a problem that the casting sand and cutting waste cannot be completely removed.

Therefore, as a result of intensive research and ingenuity, the inventor of the present invention found that
Focusing on a plurality of holes formed in the workpiece, pressure liquid for cleaning and compressed gas such as air are simultaneously supplied to the inside of the workpiece through the holes, and the liquid and gas are mixed inside the workpiece. If turbulence is generated, the cleaning fluid supplied to the inside of the workpiece will sequentially change its flow direction, so the foundry sand and cutting debris remaining inside the hole will be removed by the irregular flow of the cleaning pressure fluid. It has been found that the flow of the compressed gas separates the workpiece from the inside and leads it out to the outside together with the cleaning pressure liquid.Therefore, it is possible to obtain a workpiece free of foundry sand and cutting waste, thereby eliminating the above-mentioned disadvantages.

Therefore, an object of the present invention is to provide a cleaning method that can effectively remove excess substances adhering to a workpiece through extremely simple steps.

In order to achieve the above object, the present invention provides a workpiece that defines a chamber in which a plurality of holes communicate with each other.
One hole is selected to face the cleaning liquid outlet, while the other hole is selected to face the compressed gas outlet, and the cleaning liquid and compressed gas are supplied from the cleaning liquid outlet and the compressed gas outlet, respectively. The feature is that unnecessary materials that are supplied into the chamber and adhere to the workpiece are led out from the remaining hole.

Next, the cleaning method according to the present invention will be described in detail below by selecting a cylinder head as an example to which the cleaning method is applied, with reference to the accompanying drawings.

1 and 2, reference numeral 10 designates a cylinder head within which a chamber, or water jacket 2, is defined. On one hand, the water jacket 2 communicates with a hole 14 formed at one longitudinal end of the cylinder head 10, and on the other hand, it communicates with a water pump (not shown) defined at the other end of the cylinder head 10. It communicates with the hole 16 which leads to. Holes 18a and 18b are provided in the upper surface portion tOa of the cylinder head 10, and these holes 18a
, 18b communicate with the water jacket 12, respectively. On the other hand, the lower surface portion 10b of the cylinder head 10
Holes 20a to 20n that communicate with a cylinder block (not shown) are formed by casting, and holes 22a to 22 [that communicate with the cylinder block] are formed by cutting.

The holes 20a to 2On and the holes 22a to 22f are in communication with the water jacket 12, respectively. Note that the holes 22a to 22f and the water jacket 1
Recesses 24a to 24f are formed in the portions where the two communicate with each other, respectively.

Next, a cleaning process for cleaning the cylinder head 10 configured as described above by the method of the present invention will be described below.

First, a compressed air supply mechanism (not shown) is attached to the lower surface portion 10b of the cylinder head 10 and arranged so as to supply compressed air into the water jacket 2 from the holes 20a to 20n and the holes 22a to 22f. On the other hand, a nozzle 26 for spraying cleaning liquid is disposed in the hole 14 so as to be displaceable in the directions of arrows A and B, and a nozzle 26 for spraying cleaning liquid is similarly disposed in the holes 18a and 18b, and a nozzle 26 for spraying cleaning liquid is disposed in the hole 14 so as to be displaceable in the directions of arrows C and D. It is arranged so that it can be displaced.

Therefore, after the above preparation steps, as shown in FIG. 3a, the nozzle 26 is displaced in the direction of arrow B and its tip is engaged with the hole 14, while the nozzles 28a and 28b are It is spaced apart from the holes 18a and 18b. Here, cleaning pressure liquid is injected into the water jacket 12 from the nozzle 26, and compressed air is supplied into the water jacket 12 from an air supply mechanism (not shown) through the holes 20a to 20n and the holes 22a to 22f. As a result, as shown in FIG. 3a, a turbulent flow of fluid occurs within the water jacket 12.

That is, the cleaning liquid injected from the nozzle 26 flows as shown by the arrow, a part of which is led out from the holes 18a and 18b, and the remaining fluid is finally led out from the hole 16. Therefore, molding sand, cutting debris, etc. inside the water jacket 12 are removed to the outside together with the cleaning liquid. Furthermore, since compressed air is supplied from the holes 20a to 20n, molding sand and the like remaining in and near the holes 20a to 20n float in the cleaning liquid and are led out together with the cleaning liquid.

By the way, cutting waste from drilling the holes 22a to 22f often remains in the recesses 24a to 24f, and each of the recesses 24a to 24f has a complicated shape.
It is difficult to remove cutting debris with the flow of the cleaning fluid. Therefore,
In this embodiment, since compressed air is supplied from the holes 22a to 22f as shown by the broken line arrows, the cutting debris remaining in the respective recesses 24a to 24f is suspended in the cleaning liquid by the jetting force of the compressed air and is removed from the outside. is derived.

However, in this case, since the cleaning liquid moves only in the direction shown by the arrow, it is difficult to remove all the cutting debris remaining in each of the recesses 24a to 24f. Therefore, after the cleaning liquid is injected from the nozzle 26 into the water jacket 12 for a predetermined period of time, the second step is performed.

First, the spraying of the cleaning liquid from the nozzle 26 is stopped, and
By displacing this in the direction of arrow A, the nozzle 26 is separated from the hole 14, while the nozzles 28a and 28b are respectively displaced in the direction of arrow C and engaged with the holes 18a and 18b. After such a preparation step, cleaning liquid is injected from the nozzles 28a and 28b, and compressed air is supplied into the water jacket 12 from the holes 20a to 20n and the holes 22a to 22f. As a result, a flow of cleaning liquid and compressed air as shown in FIG. 3 is generated.

That is, the cleaning liquid sprayed from the nozzles 28a and 28b is led out through the holes 14 or 16.

Here, compressed air is supplied from the respective holes 22a to 22f as shown by broken line arrows to the recesses 24a to 24f along with the flow of the cleaning liquid as shown by the arrows.

In this case, since the flow of the cleaning liquid in the vicinity of the recesses 24a to 24f is different from the flow direction in the first step described above, the cutting debris remaining in the respective recesses 24a to 24f further floats in the cleaning liquid and flows outside. will be removed. After the cleaning liquid is supplied into the water jacket 12 from the nozzles 28a and 28b for a predetermined period of time in this way, the third
Perform the process.

That is, the nozzle 26 is again displaced in the direction of arrow B to engage the hole 14, and the nozzles 23a, 28
The nozzle 2 is connected to the holes 18a and 18b, respectively.
Cleaning liquid is simultaneously injected into the water jacket 12 from 8a, 28b and 26.

Moreover, compressed air is simultaneously supplied from the holes 20a to 20n and the holes 22a to 22f. In this case, a flow of the cleaning liquid as shown in FIG. Cutting debris remaining in each of the recesses 24a to 24f are almost completely removed and led out.

It should be noted that the flows of the cleaning liquid shown in FIGS. 3a to 3C are schematic, and it is easy to understand that in reality, the flow is a very complicated turbulent flow of compressed fluid and compressed gas. .

As described above, according to the present invention, when cleaning a workpiece,
By sequentially changing the flow direction of the cleaning liquid, it is possible to very easily and effectively remove fine cutting debris that has adhered to the holes, even for workpieces that have a large number of complicated holes, especially for cylinder heads. This makes it possible to suitably respond to cleaning of workpieces that require precision, such as the following. Note that instead of supplying compressed air from the holes 20a to 20n and the holes 22a to 22f, pressurized liquid, for example, the holes 14.1
It is also possible to use the cleaning liquid supplied from 8a and 18b.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a cylinder head as an example of applying the cleaning method according to the present invention, Fig. 2 is a bottom view of the cylinder head shown in Fig. 1, and Figs. 3a to 3C are the interior thereof. FIG. 2 is a cross-sectional view of the cylinder head showing the flow direction of cleaning liquid. 10... Cylinder head 12... Water jacket 14.16.18a, 18b... Holes 20a ~ 2
0n, 22a to 22f - holes 24a to 24
f-・Concave part

Claims (3)

[Claims] (1) For a workpiece that defines a chamber in which multiple holes communicate with each other, select one of the holes to face the cleaning liquid outlet, and select the other holes to expose the compressed gas. A discharge port is faced, and cleaning liquid and compressed gas are supplied into the chamber from the cleaning liquid discharge port and compressed gas discharge port, respectively, and unnecessary substances adhering to the workpiece are discharged to the outside from the remaining hole. Cleaning method. (2) In the method described in claim 1, the cleaning liquid outlet and the compressed gas outlet are transferred to a new hole after a predetermined period of time, and the cleaning liquid and compressed gas are introduced into the room through these holes. A cleaning method comprising supplying. (3) A cleaning method according to claim 1 or 2, in which air is used as the compressed gas.