JP2887231B2 - Core sand removal device and removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for removing core sand adhering to a hollow portion of a workpiece such as a cast product by spraying a projection material.

[0002]

2. Description of the Related Art Since a core forming a hollow portion of a work must withstand the pressure of hot water and also have shrinkage and fire resistance, a binder such as oil, dextrin or resin is added to predetermined sand. It is molded from the blended core sand, and after casting, most of the work is removed from the hollow part by sand removal by vibration or the like. Then, the remaining core sand is removed by shot blasting, hydroblasting, or a chemical method using a molten salt bath obtained by adding an oxidizing agent to an alkali.

However, in a mechanical method such as shot frust, a polishing action is applied from the outside of the work. Therefore, when a complicated concave portion such as a groove or a concave portion is formed in a hollow portion of the work, for example, FIG. In the case where a plurality of groove-shaped central concave portions 41 are formed on the wall surface of the hollow portion 40 of the cylindrical work W as shown, the core sand 42 located in the central concave portion 41 It is larger than the core sand 44 located and has less open parts, is very firmly held by seizure, etc., and has a blind spot, which makes it difficult to completely remove it.
Since the oxidizing agent is used, there are problems such as deterioration of the working environment and troublesome treatment such as waste liquid treatment, and poor working efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can completely remove even core sand adhering to a work having a complicated concave portion in a hollow portion. An object of the present invention is to provide a core sand removing device and a removing method.

[0005]

According to the present invention, which solves the above-mentioned problems, a support frame is provided in a cleaning chamber, and a vertical guide tube is mounted on the support frame. A horizontally rotatable work support table which is disposed above and rotatably supports a work having core sand adhered to a hollow portion;
Above by the operation of the deployed elevating table below the guide tube
Guide tube to ascend while alternately rising and stopping
An oblique injection nozzle that can be moved up and down
A core sand removal device, characterized in that from the injection port formed in the upper portion of the swash injection nozzle so as to inject the shot material in the hollow portion of the workpiece, core sand is attached to the hollow portion The work is supported by a horizontally rotatable work support provided in the upper part of the cleaning chamber, and the work is rotated. The oblique spray nozzle rises from below the work support to the hollow part of the work.
Is inserted so stopped are alternately repeated with, this Hasu噴
The injection port formed at the top of the injection nozzle is hollow
Stop at the position where the middle recess formed in the part can be cleaned.
Perform fixed position injection, and after a predetermined time elapse
The core sand removal method is characterized in that the core sand is removed by the blasting material injected from the injection port so as to move .

[0006]

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described in detail with reference to an illustrated apparatus capable of simultaneously processing two works. 1 and 2
, A box-shaped blast chamber 2 for blasting the core sand of the work W is installed on the base 1, and the work W
An opening 3 through which the door 3 enters and exits is formed, and the opening 4 can be opened and closed by a door 4. A shaft holding unit 5 is provided on the base 1.
And a shaft holding portion 7 corresponding to the shaft holding portion 5 is arranged facing a horizontal support frame 6 in a mounting step formed on a lower slope portion of the cleaning chamber 2. A screw rod 8 is vertically supported between the two shaft holding portions 5 and 7 via bearings 9 and 10, respectively. Furthermore, at positions symmetrical on both sides with respect to the shaft holding portion 7 of the support frame 6,
A guide cylinder 1 whose axis is in the vertical direction parallel to the axis of the screw rod 8.
1 and 11 are attached.

Further, the base 12 attached to the base 1
Has a motor 13 attached thereto, and a sequencer 14 capable of controlling the rotation of the motor 13 is connected to the motor 13.
A pulley 15 is fixed to the drive shaft of the motor 13,
A belt 17 is wound around a pulley 16 attached to the lower end of the screw rod 8, and the screw rod 8 can be continuously rotated, stopped, and the like by the motor 13 and the sequencer 14. A nut 18 is screwed onto the screw rod 8, and an elevating table 19 having a hole formed in the center thereof through which the screw rod 8 can be inserted is fixed horizontally on the upper surface of the nut 18. The lifting table 19 has support arms 20, 2
0 is provided at a predetermined interval. The lower ends of oblique spray nozzles 21, 21 slidably inserted into the guide cylinders 11, 11 are fixed to each support arm 20.

As shown in FIG. 3, the oblique injection nozzle 21
A thin cylindrical injection part 23 having an injection port 22 formed on the side surface so that the projection material can be injected onto the inner wall surface to which the core sand is attached, and the injection part 23 is connected to and held at the tip and is slidable on the guide cylinder 11. , And is fixed to the support arm 20 by a cylindrical sliding portion 24. The lower end of each sliding portion 24 is connected to a hose 25 for feeding the blast material. Further, on the upper side of the guide cylinder 11 has a word click supporting Jidai 26,
The disc-shaped bottom plate 27 of the work support base 26 is rotatably held by the guide cylinder 11 via a bearing member (not shown).
As shown in FIG. 2, a belt 3 is provided between the bottom plate 27 and a pulley 29 of a drive shaft of a motor 28 provided at the rear portion of the cleaning chamber 2.
0 is wound. A plurality of columns 31 are erected from the bottom 27, and a table 32 for mounting the work W is horizontally mounted on the upper ends of the columns 31, and an oblique spray nozzle is provided at the center of the table 32. An opening 33 for the access 21 is formed.

Next, the operation of the above-described apparatus will be described with reference to the work W shown in FIG. First, the program of the sequencer 14 can be performed by setting each of the oblique injection nozzles 21 to the lowered position, and the injection port 22 of the oblique injection nozzle 21 can clean the core sand 42 remaining on the hollow portion 41 of the hollow portion 40 of the work W. When the motor 13 reaches the opposing position, the motor 13 is stopped for a predetermined time, and at other positions, the motor 13 is made to continue the predetermined rotation. Then, the work W to which the core sands 42 and 44 adhere is placed on the table 32 of the work support base 26, and the opening 3 is closed by the door 4, and then the motor 2
When the starter 8 is activated, the work W rotates together with the table 32 via the pulley 29, the belt 30, the bottom plate 27, and the column 31. Subsequently, when the motor 13 is driven, the screw rod 8 rotates via the pulley 15, the belt 17, and the pulley 16, whereby the lifting table 19 moves up via the nut 18.
As a result, the sliding portion of each of the oblique injection nozzles 21 becomes the guide cylinder 11.
, And slides up, and the injection part 23 enters the hollow part 40 of the work W through the opening 33.

When the injection port 22 of the injection section 23 reaches an opposing position at which the core sand 44 in the crest 43 of the hollow section 40 can be polished, it is separately installed by operating a limit switch (not shown) or the like. The blast material is injected from the air blast tank through the injection port 22 through the hose 25, the sliding part 24, and the injection part 23 together with the compressed air to be in a state of the mobile injection, and the rotating work W in the ridge part 43 of the work W The child sand 44 is completely removed. Next, the injection port 22
When the gas passes through the peak 43 and is opposed to the core sand 42 in the central recess 41 so that the core sand 42 can be cleaned, the motor 13 is stopped by a signal from the sequencer 14, the rise of the oblique injection nozzle 21 stops, and the home position is stopped. The core sand 42 is in a spraying state, and the core sand 42 is polished and removed. All of the blast material and the removed core sand and the like fall down to the lower part of the blasting chamber 2 and are carried out to the outside by an appropriate transport device and projected. The material is separated and recovered and reused. After a lapse of a predetermined time required for completing the cleaning of the core sand 42, the motor 13 is restarted by the signal of the sequencer 14, and the oblique injection nozzle 21 starts to move up to the state of the mobile injection and becomes the state of the mobile injection as described above. Core part 4 of mountain part 43
4 is performed.

The above operation is alternately repeated, and the work W
When the cleaning of the entire hollow portion 40 is completed, a switching valve (not shown) is actuated by a limit switch or the like to stop the ejection of the blasting material, and only the compressed air is ejected. At the same time, the motor 13 is reversed by the sequencer 14 to ascend and descend. The table 19 descends. As a result, each of the oblique injection nozzles 21 descends while ejecting the compressed air, stops the ejection of the compressed air at a predetermined position, and then returns to the original position and stops. After that, the motor 28 is also stopped, the work support base 26 is stopped, and the work W after the cleaning of the hollow portion 40 and the cleaning with the compressed air is completed is opened by the door 4, taken out, and sent out to the next step. Note that the programming of the sequencer 14 is performed by using a concave portion 41 and a mountain portion 43 formed in the hollow portion 40 of the work W.
In accordance with the position, number, size of the workpiece W, the number of rotations of the work W, the strength of the attached core sand, etc., the motor 13 is prepared so that forward rotation, reverse rotation, rotation stop, rotation speed change, and the like can be performed. However,
In the case of a hollow portion without the central concave portion 41, it is only necessary to perform the moving injection that continuously raises the speed while appropriately changing the speed according to the adhesion state of the core sand. If necessary, a stopper for the work W is provided on the table 32, and the number of the oblique spray nozzles 21 may be one or three or more.

As an experiment, the hollow part size was 20 mmφ.
The casting having the shape shown in FIG.
Using an oblique injection nozzle with an injection port diameter of 4 mmφ while rotating at 5 rpm using an iron shot (HBC 45 to 47) with an air pressure of 0.5 MPa and a pressure of 0.18 to 0.6 mmφ, the oblique injection nozzle in FIG. As shown in the operation program, 90
All of the core sand could be removed by a second scrub. In FIG. 4, the period from 90 seconds to 120 seconds is a cleaning section by air injection, and is a section in which no projection material is injected.

[0014]

As described above, according to the present invention, the oblique spray nozzle is inserted into the hollow portion of the rotating work, and the core material is removed by injecting the projectile in close proximity while raising the nozzle. Extremely efficient, can be reliably removed in a short time,
In addition, since the work is held vertically, there is no blasting material or core sand remaining inside the work, and since the work is not a chemical method, there is no problem such as waste liquid treatment. Further, in the case where a hollow portion is formed in the hollow portion, when the oblique injection nozzle reaches a position at which the hollow portion can be cleaned, the rise is stopped or decelerated to stop the core located in the hollow portion. The sand can be intensively blasted, and therefore, the core sand can be completely removed without causing a dead spot or the like of the core sand which is difficult to remove. In addition, the lifting and lowering of the lifting table with the oblique injection nozzle fixed according to the position, number, size, etc. of the central recess can be alternately repeated, so that the core sand can be completely removed automatically. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a preferred embodiment of a core sand removing device of the present invention.

FIG. 2 is a partially cutaway side view taken along line II-II of FIG.

FIG. 3 is a partially cutaway front view of an injection unit of an oblique injection nozzle.

FIG. 4 is a graph showing an example of an operation program of the oblique injection nozzle.

FIG. 5 is a partially cutaway front view showing an example of core sand adhering to a hollow portion of a work.

[Explanation of symbols]

2 Polishing room 6 Support frame 11 Guide cylinder 19 Elevating table 21 Oblique injection nozzle 22 Injection port 26 Work support table 40 Hollow part 41 Center concave part 42 Core sand 44 Core sand W Work

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B24C 3/16 B24C 5/02 B24C 9/00

Claims (2)

(57) [Claims] 1. A mounting a Ken掃室(2) which in vertical guide tube support frame (6) provided in the (11), further, this Ken掃室(2) within the guide cylinder ( A horizontally rotatable work support base (26) that is arranged above the 11) and rotatably supports the work with the core sand adhered to the hollow part, and an elevating unit that is arranged below the guide cylinder (11) The table (19) operates to ascend and stop.
Inserted through the guide tube (11) so as to ascend while repeating each other
The oblique injection nozzle (21) that can move up and down
Core sand removing apparatus characterized by elevation nozzle (21) upper part formed by being injection port than (22) and adapted to inject the shot material in the hollow portion of the workpiece. 2. A work having core sand adhered to a hollow portion is supported by a horizontally rotatable work support provided in an upper portion of the cleaning chamber, and the work is rotated. The oblique injection nozzle rises and stops at the hollow part of the workpiece.
Inserted so that they are repeated with each other,
The injection port formed at the top is formed in the hollow part of the workpiece.
Stop at the position where the inside concave part that can be cleaned can be cleaned and fixed position injection
So that after a predetermined time has elapsed,
A method for removing core sand, wherein the core material is removed by a blast material injected from the injection port.