JPH07308751A - Method for removing residual foreign matter in inner part of hollow casting - Google Patents

Abstract

PURPOSE:To make possible the removal of residual foreign material in the inner part of a hollow casting provided with opening parts and a hollow part communicated with the opening parts by constituting with a vibration giving means of the hollow casting, an air supplying means having a compressed air nozzle part and a nozzle pressing part and a filtering means having a filter and a filter pressing part. CONSTITUTION:The nozzle pressing part 31 in the air supplying means 3 is worked to a work 5 under condition of charging abrasive grains 7 into the hollow part 52 and the compressed air nozzle part 30 is pressed and held to the one side of opening part 54 and made to be the fitting and air-tightly holding condition. Further, the filter pressing part 31 in the filtering means 4 is worked and the filter 40 is pressed, held and fitted to the other side of opening part 53. Thereafter, the vibration is given with an excitor 22 in a vibration giving means 2 to vibrate the work and at the same time, the compressed air is spouted toward the hollow part 52 of the work 5 from the compressed air nozzle part 30. By this method, the scattered abrasive grains 7 are collided etc., of the hollow part 52 to grind and clean the wall surface 52a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior of a hollow casting manufactured by a casting manufacturing method and having a complicated hollow portion inside, which can be used for cleaning work such as closed deck cylinder block, intake manifold, surge tank, etc. The present invention relates to a device for removing foreign matter remaining in the product.

[0002]

[Prior art]

(1) In Japanese Laid-Open Patent Publication No. 3-234471, in order to prevent dents, bends, cracks and the like from being generated on the surface of the work, the work is carried using a walking beam without using a hanger, and shot during the work. A shot blasting device that performs blasting is disclosed. (2) Japanese Laid-Open Patent Publication No. 64-16375 discloses that in order to prevent the cast product from being damaged or deformed,
Disclosed is a cleaning device for a cast product, which holds a workpiece, imparts rotational motion, and sprays abrasive grains from a nozzle that swings in a direction perpendicular to the rotational direction.

[0003]

In each of the conventional apparatuses disclosed in the above (1) and (2), in order to clean the outer surface of the cast product after casting, abrasive grains are applied to the outer surface. It is something to spray. Therefore, each of the above conventional devices,
Its application is limited to cleaning the outer surface of a casting. That is, as a casting product to be cleaned, for example,
When a closed deck cylinder block having an opening and a hollow portion of a complicated shape communicating with the opening is used,
It is difficult to remove and clean the core sand and the coating agent remaining on the wall surface of the hollow portion after casting by the conventional devices.

Therefore, it is possible to manually insert a nozzle from the opening of the casting into the hollow portion and spray the abrasive particles ejected from the nozzle onto the wall surface of the hollow portion. If it has a cut, it cannot be completely cleaned. The present invention has been made in view of the above problems, and an object thereof is to provide a casting product including an opening and a hollow portion communicating with the opening, that is, a removal device capable of removing foreign matter remaining inside a so-called hollow casting. And

[0005]

A device for removing foreign matter remaining inside a hollow casting according to the present invention is provided with a hollow casting and a hollow casting having a plurality of openings communicating with the hollow section. A vibration imparting means for imparting vibration to the hollow casting, and a compressed air nozzle portion detachably attached to at least one of the openings of the hollow casting mounted on the vibration imparting means to eject compressed air into the hollow portion. A filter detachably attached to the other opening of the hollow casting mounted on the vibration imparting means, the air supplying means having a nozzle pressing portion for pressing and holding the compressed air nozzle portion to the opening. And a filter pressing unit for pressing and holding the filter in the opening.

[0006]

The operation of the apparatus for removing foreign matters remaining inside the hollow casting of the present invention (hereinafter referred to as the removing apparatus of the present invention) configured as described above will be described below. First, prior to use of the removing apparatus of the present invention, a hollow casting having a hollow portion and a plurality of openings communicating with the hollow portion is prepared as an internal residual foreign matter removal target product.

The hollow casting is placed on the vibration imparting means of the removing apparatus of the present invention, and a predetermined amount of abrasive grains having a particle size which does not pass through the filter is introduced into the hollow portion from the opening of the hollow casting. After that, the nozzle pressing portion of the air supply means is moved forward (moved forward) to one of the plurality of openings of the hollow casting to mount the compressed air nozzle portion and press and hold it. Then, the filter pressing portion of the filtering means is moved forward (moving forward) to attach the filter to the other of the plurality of openings of the hollow casting and to press and hold the filter. Then, the hollow casting is subjected to a fixing action force by the nozzle pressing portion of the air supply means and a fixing action force integrally fixed to the vibration applying means by the filter pressing portion. Therefore, the hollow casting is securely fixed and held on the mounting portion of the vibration applying means.
Further, the opening of the hollow casting in which the compressed air nozzle portion and the filter are mounted becomes airtight to the outside.

Vibration of a predetermined magnitude is applied to the hollow casting in the above state by the vibration applying means. On the other hand, at the same time, compressed air is ejected from the compressed air nozzle portion of the air supply means toward the inside of the hollow portion of the hollow casting.
Then, the abrasive grains charged into the hollow portion of the hollow casting are rolled up by the compressed air and violently leap and vibrate due to the applied vibration, and the wall surface of the hollow portion of the hollow casting and the abrasive. The particles and the residual foreign matter such as core sand and coating agent that have been seized on the wall surface rub against the abrasive grain, and the residual foreign matter collides with the abrasive grain and is hit hard.

As a result, the residual foreign matter is peeled off and removed from the wall surface, and the peeled coating agent is immediately mixed in the discharge flow of the compressed air, and the coating agent of the filtration means attached to the opening of the hollow casting is removed. It passes through the filter and is discharged to the outside. At this time, the abrasive grains in the hollow portion and the peeled-off core sand are prevented from jumping out with the discharge flow of the compressed air by the filter, and the impact action of the residual foreign matter is repeatedly performed in the hollow portion. . In this way, the hollow casting becomes clean by removing the residual foreign matter strongly attached to the wall surface of the hollow portion. The coating agent discharged to the outside can be collected separately by a collecting device such as a dust collector provided.

Thereafter, the application of vibration to the hollow casting by the vibration applying means and the ejection of compressed air by the compressed air nozzle portion of the air supply means are stopped. At the same time, the nozzle pressing portion of the air supply means is returned to the original position (returned movement) to release the attachment and pressure holding of the compressed air nozzle portion to the opening of the hollow casting. Further, the filter pressing portion of the filtering means is operated again (removed) to release the mounting and pressing holding of the filter to the opening of the hollow casting.

After the purification of the hollow portion is completed, the hollow casting is taken out from the vibration applying means.

[0012]

EXAMPLE An example of a device for removing foreign matter remaining inside a hollow casting according to the present invention (hereinafter referred to as a removing device) will be described as a hollow casting, which is a closed deck cylinder block (hereinafter referred to as a work piece) that is a component of an automobile engine. Will be applied) and will be described based on FIGS. 1 to 4.

The removing device 1 of the embodiment shown in FIG. 1 comprises a vibration applying means 2, a pair of air supplying means 3 and a filtering means 4. The vibration applying means 2 is installed on the upper surface 21 of the flat base portion 20, generates vibrations, and has a vibration exciter 22 having a vibration transmission cam 22a, and is arranged around the vibration exciter 22 at a predetermined interval. A plurality of coil-shaped support springs 23 (only shown on the left and right are shown in FIGS. 1 and 2) provided with sufficient strength, and a mounting surface 24a on which the work 5 is mounted, and a lower surface 24b. Is the support spring 23
Is mounted and held substantially horizontally on the upper end of the plate, contacts the vibration transmission cam 22a of the vibration exciter 22, and is mounted so that vibration from the vibration exciter 22 is applied. The table 24 is provided.

The mounting table 24 is three-dimensionally (vertical direction, horizontal direction, front-back direction) by the action of each support spring 23 when vibration is applied from the vibration exciter 22 during operation.
It is elastically supported so that it can swing. The vibration frequency of the mounting table 24 during the operation of the shaker 22 is 20 to 200H.
Z and amplitude are set in the range of 2 to 40 mm. The conditions such as the frequency and the amplitude are not limited to the above numerical values, but can be set variously.

As will be described later, the pair of air supply means 3 is used at a target position facing both side surfaces 5a of the work 5 placed on the placing surface 24a of the placing table 24.
Therefore, as shown in FIG. 4, each of the air supply means 3 is detachably attached to each of the two side openings 54 that are opened on both side surfaces 5a of the work 5 at the target positions facing each other. Each hollow portion 52 of the work 5 (see FIGS.
Compressed air nozzle portion 30 for ejecting compressed air to
Nozzle pressing portion 3 that presses and holds the compressed air nozzle portion 30 on the peripheral end surface 54a (see FIG. 3) of the side opening portion 54 of the work 5.
It consists of 1.

The compressed air nozzle section 30 is held by a pressing plate 34 of a nozzle pressing section 31 described later. Therefore, the compressed air nozzle portion 30 is movable together with the pressing plate 34 by the reciprocating operation of the cylinder 33 in the direction toward and away from the side opening portion 54 of the work 5. Further, the compressed air nozzle portion 30 is connected to a compressed air supply source equipped with an opening / closing valve (not shown) through a flexible passage 30a.
The pressure of the compressed air sent from the compressed air supply source to the compressed air nozzle unit 30 through the opening / closing valve is 2 to 10 kg /
It is set to cm ² . The pressure value of the compressed air is
Various changes are possible.

The nozzle pressing portion 31 is held on a side peripheral wall 60 of a rectangular box-shaped cover member 6 which covers the periphery of the work 5 at a predetermined interval and opens downward, and the cylinder rod 3
A cylinder that operates 2 in a reciprocating direction (arrows X1 and X3 are arranged on the right side of the work 5 shown in FIGS. 1, 2, and 4 and arrows X2 and X4 are arranged on the left side of the work 5). 33, and a seal portion 34, one end surface side of which is connected to the tip of the cylinder rod 32 and the other end surface side of which is made of an elastic body.
and a pressing plate 34 provided with a.

The filtering means 4 is a filter 40 detachably attached to the upper opening 53 of the work 5 placed on the placing surface 24a of the placing table 24 of the vibration applying means 2,
It has a filter pressing portion 41 that presses and holds the filter 40 so as to face the upper opening 53. The filter 40 is
The pressure plate 4 is held by a pressure plate 44 of a filter pressing portion 41, which will be described later, and is attached to a plurality of exhaust holes 45 formed in the pressure plate 44.
4 is movable in a direction toward and away from the upper opening 53 of the work 5. The filter 40 is
It is made of wire mesh (mesh 20 to 50). Note that the filter 40 is not limited to a wire mesh, and has a predetermined strength and a hole having a size that does not allow the abrasive grains 7 described later to pass but allows the peeled coating agent in the hollow portion 52 to pass. Any material can be used as long as it is For example, a vent plug or the like can be used.

The filter pressing portion 41 is held by the upper wall 61 of the cover member 6 and operates a cylinder rod 42 in a reciprocating direction (directions of arrows Y1 and Y2 shown in FIGS. 1, 2 and 4), and a cylinder 43. The upper end surface side is connected to the tip end of the cylinder rod 42, and a pressing plate 44 having a seal portion 44a made of an elastic body is provided on the lower end surface side facing the upper end surface 5b of the work 5. The pressing plate 44 has a work 5 described later.
A plurality of exhaust holes 45 provided at positions facing the plurality of upper openings 53, and the filter 40 mounted in each exhaust hole 45.

The work 5 used in the embodiment is AC.
It is manufactured by casting using an aluminum alloy such as 2B by a high pressure casting method. The work 5 includes a cylinder block main body (hereinafter referred to as a main body) 50 which has a substantially inverted T-shaped cross-section on the front side as viewed from the left side (front side) in FIG. 3 and extends to the right side (depth side). As shown in FIGS. 2, 3, and 5, the main body 50 has a symmetrical shape in the left-right direction and the front-rear direction, is arranged at a predetermined interval in the longitudinal direction, and has two cylinder bores 51 penetrating vertically. An annular hollow portion 5 which is formed at a position surrounding each of the cylinder bores 51 and constitutes a part of a circulation path of the circulating cooling liquid.
2, a plurality of upper openings 53 for communicating cooling liquid horizontally from both side surfaces 5a of the main body 50 to the hollow portion 52, and a cylinder bore 51 communicating vertically from the upper end surface 5b of the main body 50 to the hollow portion 52. A plurality of side openings 54 are formed for discharging the high temperature cooling liquid after cooling.

The cover member 6 has an upper wall 61,
A suction passage 63 is provided which communicates with the accommodation space 62 of the work 5 formed by placing the side peripheral wall 60 on the placement table 24 and which is connected to a suction pump of a residual foreign matter collecting device (dust collector) not shown. ing. Further, the cover member 6 can be reciprocated in the vertical direction (see arrows Y1 and Y2 shown in FIG. 1) by an actuator (not shown), and is moved forward so that the side peripheral wall 60 is mounted on the mounting surface 24a of the mounting table 24. When placed, the work 5 can be covered with a predetermined space and held in a state where the accommodation space 62 is formed. When the work 5 is moved back and separated from the placement surface 24a, the work 5 can be attached / detached to / from the placement surface 24a. It is configured to be held in a non-obstructing position.

The operation of the apparatus 1 of the embodiment configured as described above will be described. The cast work 5 continues to be 50
After being held in a heating furnace at 0 ° C. for 2 hours, an upper opening 53 and a side opening 54 of the work 5 are knocked out by a knockout machine.
Although a work operation for discharging the core sand is performed, the wall surface 52a of the hollow portion 52 does not remove residual foreign matters such as the burned-in core sand and the coating agent. Therefore, it cannot be completely removed by ordinary shot blasting or the like. Therefore, using the device 1 of the embodiment, as shown below,
Work to remove residual foreign matter is performed.

The mounting table 2 of the vibration exciter 22 of the removing device 1
A work 5 to be subjected to a work of removing residual foreign matter is placed on 4. A predetermined amount of abrasive grains 7 such as shot balls, grit, glass beads, steel, and wires are introduced from the upper opening 53 of the work 5. The average grain size of the abrasive grains 7 is 0.5 to 2 mm. Next, after the cover member 6 is placed on the placing surface 24a of the placing table 24, each cylinder 33 of the pair of air supply means 3 and the cylinder 43 of the filtering means 4 are operated.

Then, each cylinder 33 of the air supply means 3
Moves the cylinder rod 32 forward (moves the one arranged on the right side of the work 5 shown in FIGS. 1, 2, and 4 in the arrow X1 direction and moves the one arranged on the left side of the work 5 in the arrow X2 direction). , The compressed air nozzle portion 30 together with the pressing plate 34
Are linked in the same direction. The pressing plate 34 is attached to the work 5 via the seal portion 34 a and the peripheral end surface 5 of the side opening 54.
It abuts against 4a and holds it. At this time, the work 5 is
Both side surfaces 5a are sandwiched between a pair of pressing plates 34 and are fixedly held.

On the other hand, the cylinder 43 of the filtering means 4 moves the cylinder rod 42 forward (arrow Y1 shown in FIGS. 1, 2 and 4).
(Moving in the direction) to interlock the pressing plate 44. Then,
The pressing plate 44 abuts and holds the work 5 against the upper end surface 5b via the seal portion 44a. For this reason, the work 5 is pressed against the upper surface 24a of the mounting table 24 of the vibration exciter 22, clamped, and interlocked with the mounting table 24 at the time of vibration, and is held in a state of resisting vibration.
Further, each filter 40 of the pressing plate 44 is mounted at a position communicating with each upper opening 53 of the work 5 together with each exhaust hole 45, and each upper opening 53 of the work 5 is attached to the seal portion 4.
It is sealed by 4a and kept airtight.

The work 5 in the above-described state is vibrated by the vibration exciter 22 via the mounting table 24. On the other hand, at the same time, compressed air (see arrow a in FIG. 2) is ejected from the compressed air nozzle portion 30 of the pair of air supply means 3 into the hollow portion 52 of the work 5. Then, the abrasive grains 7 in the hollow portion 52 of the work 5 are rolled up by the compressed air and violently jump and vibrate due to the applied vibration, and the wall surface 52 a of the hollow portion 52 of the work 5 and the abrasive grains 7 are vibrated.
And the foreign particles remaining on the wall surface 52a such as the core sand and the coating agent and the abrasive grains 7 rub against each other, and the wall surface 52a
Abrasive grains 7 hit the residual foreign matter of a violently.

As a result, the foreign matter remaining on the wall surface 52a is ground and cleaned by the abrasive grains 7, and is separated and removed from the wall surface 52a. Further, the coating agent separated from the wall surface 52a is mixed in the discharge flow of the compressed air (see the arrow b in FIG. 2) one after another and permeates the filter 40 of the filtering means 4 mounted in the upper opening 53 of the work 5. , And is discharged to the accommodation space 62 of the work 5 of the cover member 6. The peeled coating agent discharged to the accommodation space 62 is sucked into the suction passage 63 provided in the upper wall 61 of the cover member 6 together with the discharge flow of the compressed air (see the arrow c in FIG. 2).
Through the, it is sucked and collected by a residual foreign matter collecting device (not shown).

At this time, the abrasive grains 7 in the hollow portion 52 and the separated core sand are separated from the discharge flow of the compressed air by the filter 40 and do not fly out of the hollow portion 52. In this way, when the wall surface 52a of the hollow portion 52 of the work 5 is finished to be ground and cleaned, the vibration imparted by the vibrator 22 and the ejection of the compressed air by the compressed air nozzle portions 30 are stopped.

Next, the respective cylinders 33 of the pair of air supply means 3 and the cylinders 43 of the filtration means 4 are operated in reverse to the above case. Then, the cylinder 33 of each air supply means 3
Moves the cylinder rod 32 back (the one arranged on the right side of the work 5 shown in FIGS. 1, 2, and 4 moves in the arrow X3 direction, and the one arranged on the left side of the work 5 moves in the arrow X4 direction). , The compressed air nozzle portion 30 together with the pressing plate 34
Are linked in the same direction. The pressing plate 34 releases the pressing and holding of the peripheral end surface 54a of the side opening 54 of the work 5.
At this time, the attachment of each compressed air nozzle portion 30 to each side opening portion 54 of the work 5 is also released.

On the other hand, the cylinder 43 of the filtering means 4 moves the cylinder rod 42 back (arrow Y2 shown in FIGS. 1, 2 and 4).
Direction)), and the pressing plate 44 moves the upper end surface 5 of the work 5.
Release the pressure holding of b. Therefore, the work 5 is released from the clamp on the mounting surface 24a of the mounting table 24 of the vibration exciter 22. After this, the mounting surface 24a of the mounting table 24
Then, the cover member 6 is detached, and the work 5 that has been polished and cleaned is taken out. After that, the abrasive grains 7 are removed from the work 5 to complete the polishing. The abrasive grains 7 used for the blasting are separated from the mixed core sand and reused.

As described above, according to the removing apparatus 1 of the embodiment,
With respect to the work 5 in which the abrasive grains 7 have been charged into the hollow portion 52, the nozzle pressing portion 31 of the air supply means 3 is operated to press and hold the compressed air nozzle portion 30 in the side opening 54, and the mounting and pressing plate 34 is attached. The side opening 54 through the seal portion 34a.
The side opening 54 is brought into contact with the peripheral end surface 54a of the above and the side opening 54 is kept airtight. Further, the filter pressing portion 41 of the filtering means 4
Is operated to press and hold the filter 40 in the upper opening 53 through the exhaust hole 45 of the pressing plate 44, so that the filter 40 is mounted.

After that, vibration is applied and vibrated by the vibrator 22 of the vibration applying means 2, and at the same time, compressed air is jetted from the compressed air nozzle portion 30 toward the hollow portion 52 of the work 5. As a result, the abrasive grains 7 that have jumped up and fallen off the wall surface 52a and the wall surface 52a of the hollow portion 52 of the vibrating workpiece 5.
By causing collision and friction with the residual foreign matter that has been seized on the wall surface 52a, the wall surface 52a is ground and cleaned, and the residual foreign matter that has been firmly adhered until now can be separated and removed from the wall surface 52a and cleaned.

A wall surface 52a of the hollow portion 52 of the work 5
The more released coating agent immediately passes through the filter 40 from the hollow portion 52 and is discharged to the outside together with the discharge flow b of the compressed air, so that the mixing ratio of the coating agent to the abrasive grains 7 can be reduced, and The fluidity of the grains 7 is improved. Then, the polishing and cleaning force of the abrasive grains 7 is improved, and the polishing and cleaning time can be shortened. Furthermore, since the peeled coating agent does not accumulate in the hollow portion 52, it is not necessary to carry out the secondary treatment of the peeled coating agent after using the removing apparatus 1 of the embodiment, which is advantageous in terms of cost. It will be

[0034]

EFFECTS OF THE INVENTION According to the apparatus for removing foreign matter remaining inside the hollow casting of the present invention (hereinafter referred to as the removal apparatus of the present invention), the hollow casting in which abrasive grains are introduced into the hollow portion is
The nozzle pressing portion of the air supply means is actuated, and the compressed air nozzle portion is pressed and held in one opening so that the compressed air nozzle portion is mounted and kept airtight. Further, the filter pressing portion of the filtering means is activated to press and hold the filter in the other opening so that the filter is mounted.

Thereafter, vibration is applied by the vibration applying means to vibrate, and at the same time, compressed air is jetted from the compressed air nozzle portion toward the hollow portion of the hollow casting. As a result, the splashed abrasive particles collide with the wall surface of the hollow part of the vibrating hollow casting and the residual foreign matter burned on the wall surface to cause friction, which causes the wall surface to be abraded and firmly adhered until now. Residual foreign matter is peeled off from the wall surface and removed, so that it can be cleaned.

Further, since the coating agent separated from the wall surface of the hollow portion of the hollow casting is immediately discharged to the outside through the filter from the hollow portion together with the discharge flow of the compressed air, the coating agent for the abrasive grains is discharged. It is possible to reduce the mixing ratio of the particles and improve the fluidity of the abrasive grains. Further, the abrasive cleaning power of the abrasive grains is improved, and the abrasive cleaning time can be shortened. Further, since the peeled coating agent does not accumulate in the hollow portion, it is unnecessary to carry out the secondary treatment of the peeled coating agent after using the removing apparatus of the present invention, which is also advantageous in terms of cost. Becomes

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a removing device of an embodiment and showing a state in which a hollow casting is placed on a placement portion of a vibration applying means of the removing device.

FIG. 2 is a cross-sectional view showing a removing device of an embodiment and showing a usage state of the removing device.

FIG. 3 is a perspective view showing the appearance of the hollow casting in FIGS. 1 and 2 in perspective.

FIG. 4 is a perspective view showing an external appearance of a main part of the removing device in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Removal apparatus of the foreign material remaining inside a hollow casting 2 ... Vibration imparting means 22 ... Vibrating machine 23 ... Support spring 24 ... Mounting table 3 ... Air supply means 30 ... Compressed air nozzle section 31
... Nozzle pressing part 32 ... Cylinder rod 33 ... Cylinder 34 ... Pressing plate 34a ... Seal part 4 ... Filtration means 40 ... Filter 41 ...
Filter pressing part 42 ... Cylinder rod 43 ... Cylinder 44
... Pressing plate 44a ... Seal part 45 ... Exhaust hole 5 ... Workpiece 50 ... Cylinder block body 51 ... Cylinder bore 52 ... Hollow part 53 ... Upper opening 5
4 ... Side opening 6 ... Cover member 7 ... Abrasive grain

Claims (1)

[Claims] 1. A vibration imparting means for placing a hollow casting and a hollow casting having a plurality of openings communicating with the hollow portion and imparting vibration to the hollow casting; and a vibration imparting means for placing the vibration on the vibration imparting means. An air having a compressed air nozzle part detachably attached to at least one of the openings of the hollow casting and ejecting compressed air into the hollow part, and a nozzle pressing part for pressing and holding the compressed air nozzle part to the opening. Filtration means having a supply means, a filter detachably attached to the other opening of the hollow casting mounted on the vibration imparting means, and a filter pressing portion for pressing and holding the filter in the opening. And a device for removing foreign matter remaining inside the hollow casting.